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+#$# git-fat 759292776cfaf7e3ed788fe32d14b99c138fb211 34156
--- /dev/null
+#$# git-fat 471867cda344bda2feee24069e7eb8f1af3029c3 15689
--- /dev/null
+p.boxed
+ | The player in first has a different set of pieces,
+ | moving generally like a queen but capturing (almost) as usual.
+
+figure
+ img.img-center(src="/variants/Empire/Board.png")
+ figcaption.text-center Initial deterministic setup.
+
+p.
+ Empire Chess is a chess variant designed in 2020 by Couch Tomato, the third
+ asymmetric game. This game pits the army of the "Empire" (gold) against the
+ original chess army (the "Kingdom", black). The Empire's unique feature is
+ that its pieces move like queens but attack differently.
+
+h3 General Rules
+
+ol
+ li The Empire (gold) always moves first.
+ li The Empire cannot castle.
+ li.
+ As the Empire's pawns start on the third rank, they do not have the
+ option to move two spaces or be captured by en passant. Kingdom pawns
+ retain the ability to move two spaces initially and to be captured via
+ en passant.
+ li Pawns on either side can only promote to a queen.
+ li.
+ An additional method of victory is available: called campmate.
+ Campmate is achieved by moving one's king into the final rank
+ without being check.
+ li Stalemate and repetition are both losses.
+ li.
+ Facing kings — The King and Kaiser (Imperial King) may not face
+ each other on a file or rank, similar to Xiangqi.
+
+h3 Imperial Pieces
+
+p.
+ There are five new units unique to the Empire: 2 Siege Towers, 2 Eagles,
+ 2 Cardinals, 1 Duke, and 2 Soldiers. The bottom rank are all stronger than
+ their Kingdom counterparts with the exception of the Duke.
+
+ul
+ li.
+ Kaiser (K) — The Imperial king is called the Kaiser and has a
+ different symbol, but is essentially the same as the Kingdom's King,
+ also using the same abbreviation (K) — the change is purely
+ aesthetic and thematic.
+ li.
+ Soldier (S) — The Soldiers are the two pawn-like pieces replacing
+ the two middle pawns. These act like promoted soldiers in Xiangqi and
+ can move one square orthogonally in any direction except backwards.
+
+p.
+ The remaining pieces are divergent pieces, pieces that move differently
+ than they attack (such as pawns). Imperial pieces all move as queens,
+ but attack like their Kingdom counterpart except for the Duke.
+
+ul
+ li.
+ Siege Tower (T) — The Siege Tower, or Tower for short, moves like a
+ Queen but attacks like a Rook.
+ li Eagle (E) — The Eagle moves like a Queen but attacks like a Knight.
+ li.
+ Cardinal (C) — The Cardinal moves like a Queen
+ but attacks like a Bishop.
+ li Duke (D) — The Duke moves like a Queen but attacks like a King.
+
+figure
+ img.img-center(src="/variants/Empire/EagleMoves.png")
+ figcaption.text-center Eagle's moves (green) & captures (red).
+
+h3 Piece valuation
+
+p The following simplified values are used by the bot:
+
+table
+ tr
+ th Kingdom piece
+ th Value
+ th Imperial piece
+ th Value
+ tr
+ td Pawn
+ td 1
+ td Pawn
+ td 1
+ tr
+ td Queen
+ td 9
+ td Duke
+ td 4
+ tr
+ td Bishop
+ td 3
+ td Cardinal
+ td 4
+ tr
+ td Knight
+ td 3
+ td Eagle
+ td 7
+ tr
+ td Rook
+ td 5
+ td Siege Tower
+ td 7
+ tr
+ td Soldier
+ td 2
+ td -
+ td -
+
+h3 More information
+
+p
+ | See
+ a(href="https://www.pychess.org/variant/empirechess") Empire Chess
+ | on pychess-variants, where you can also play this variant.
--- /dev/null
+p.boxed TODO
--- /dev/null
+p.boxed TODO
--- /dev/null
+p.boxed TODO
--- /dev/null
+p.boxed TODO
--- /dev/null
+p.boxed TODO
--- /dev/null
+import { ChessRules } from "@/base_rules";
+
+export class EmpireRules extends ChessRules {
+
+ static get PawnSpecs() {
+ return Object.assign(
+ {},
+ ChessRules.PawnSpecs,
+ { promotions: [V.QUEEN] }
+ );
+ }
+
+ static get LoseOnRepetition() {
+ return true;
+ }
+
+ static IsGoodFlags(flags) {
+ // Only black can castle
+ return !!flags.match(/^[a-z]{2,2}$/);
+ }
+
+ getPpath(b) {
+ return (b[0] == 'w' ? "Empire/" : "") + b;
+ }
+
+ static GenRandInitFen(randomness) {
+ if (randomness == 0)
+ return "rnbqkbnr/pppppppp/8/8/8/PPPSSPPP/8/TECDKCET w 0 ah -";
+
+ // Mapping kingdom --> empire:
+ const piecesMap = {
+ 'R': 'T',
+ 'N': 'E',
+ 'B': 'C',
+ 'Q': 'D',
+ 'K': 'K'
+ };
+
+ const baseFen = ChessRules.GenRandInitFen(randomness);
+ return (
+ baseFen.substr(0, 24) + "PPPSSPPP/8/" +
+ baseFen.substr(35, 8).split('').map(p => piecesMap[p]).join('') +
+ baseFen.substr(43, 5) + baseFen.substr(50)
+ );
+ }
+
+ getFlagsFen() {
+ return this.castleFlags['b'].map(V.CoordToColumn).join("");
+ }
+
+ setFlags(fenflags) {
+ this.castleFlags = { 'b': [-1, -1] };
+ for (let i = 0; i < 2; i++)
+ this.castleFlags['b'][i] = V.ColumnToCoord(fenflags.charAt(i));
+ }
+
+ static get TOWER() {
+ return 't';
+ }
+ static get EAGLE() {
+ return 'e';
+ }
+ static get CARDINAL() {
+ return 'c';
+ }
+ static get DUKE() {
+ return 'd';
+ }
+ static get SOLDIER() {
+ return 's';
+ }
+ // Kaiser is technically a King, so let's keep things simple.
+
+ static get PIECES() {
+ return ChessRules.PIECES.concat(
+ [V.TOWER, V.EAGLE, V.CARDINAL, V.DUKE, V.SOLDIER]);
+ }
+
+ getPotentialMovesFrom(sq) {
+ let moves = [];
+ const piece = this.getPiece(sq[0], sq[1]);
+ switch (piece) {
+ case V.TOWER:
+ moves = this.getPotentialTowerMoves(sq);
+ break;
+ case V.EAGLE:
+ moves = this.getPotentialEagleMoves(sq);
+ break;
+ case V.CARDINAL:
+ moves = this.getPotentialCardinalMoves(sq);
+ break;
+ case V.DUKE:
+ moves = this.getPotentialDukeMoves(sq);
+ break;
+ case V.SOLDIER:
+ moves = this.getPotentialSoldierMoves(sq);
+ break;
+ default:
+ moves = super.getPotentialMovesFrom(sq);
+ }
+ if (
+ piece != V.KING &&
+ this.kingPos['w'][0] != this.kingPos['b'][0] &&
+ this.kingPos['w'][1] != this.kingPos['b'][1]
+ ) {
+ return moves;
+ }
+ // TODO: factor two next "if" into one (rank/column...)
+ if (this.kingPos['w'][1] == this.kingPos['b'][1]) {
+ const colKing = this.kingPos['w'][1];
+ let intercept = 0; //count intercepting pieces
+ let [kingPos1, kingPos2] = [this.kingPos['w'][0], this.kingPos['b'][0]];
+ if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+ for (let i = kingPos1 + 1; i < kingPos2; i++) {
+ if (this.board[i][colKing] != V.EMPTY) intercept++;
+ }
+ if (intercept >= 2) return moves;
+ // intercept == 1 (0 is impossible):
+ // Any move not removing intercept is OK
+ return moves.filter(m => {
+ return (
+ // From another column?
+ m.start.y != colKing ||
+ // From behind a king? (including kings themselves!)
+ m.start.x <= kingPos1 ||
+ m.start.x >= kingPos2 ||
+ // Intercept piece moving: must remain in-between
+ (
+ m.end.y == colKing &&
+ m.end.x > kingPos1 &&
+ m.end.x < kingPos2
+ )
+ );
+ });
+ }
+ if (this.kingPos['w'][0] == this.kingPos['b'][0]) {
+ const rowKing = this.kingPos['w'][0];
+ let intercept = 0; //count intercepting pieces
+ let [kingPos1, kingPos2] = [this.kingPos['w'][1], this.kingPos['b'][1]];
+ if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+ for (let i = kingPos1 + 1; i < kingPos2; i++) {
+ if (this.board[rowKing][i] != V.EMPTY) intercept++;
+ }
+ if (intercept >= 2) return moves;
+ // intercept == 1 (0 is impossible):
+ // Any move not removing intercept is OK
+ return moves.filter(m => {
+ return (
+ // From another row?
+ m.start.x != rowKing ||
+ // From "behind" a king? (including kings themselves!)
+ m.start.y <= kingPos1 ||
+ m.start.y >= kingPos2 ||
+ // Intercept piece moving: must remain in-between
+ (
+ m.end.x == rowKing &&
+ m.end.y > kingPos1 &&
+ m.end.y < kingPos2
+ )
+ );
+ });
+ }
+ // piece == king: check only if move.end.y == enemy king column,
+ // or if move.end.x == enemy king rank.
+ const color = this.getColor(sq[0], sq[1]);
+ const oppCol = V.GetOppCol(color);
+ // check == -1 if (row, or col) unchecked, 1 if checked and occupied,
+ // 0 if checked and clear
+ let check = [-1, -1];
+ return moves.filter(m => {
+ if (
+ m.end.y != this.kingPos[oppCol][1] &&
+ m.end.x != this.kingPos[oppCol][0]
+ ) {
+ return true;
+ }
+ // TODO: factor two next "if"...
+ if (m.end.x == this.kingPos[oppCol][0]) {
+ if (check[0] < 0) {
+ // Do the check:
+ check[0] = 0;
+ let [kingPos1, kingPos2] =
+ [this.kingPos[color][1], this.kingPos[oppCol][1]];
+ if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+ for (let i = kingPos1 + 1; i < kingPos2; i++) {
+ if (this.board[m.end.x][i] != V.EMPTY) {
+ check[0]++;
+ break;
+ }
+ }
+ return check[0] == 1;
+ }
+ // Check already done:
+ return check[0] == 1;
+ }
+ //if (m.end.y == this.kingPos[oppCol][1]) //true...
+ if (check[1] < 0) {
+ // Do the check:
+ check[1] = 0;
+ let [kingPos1, kingPos2] =
+ [this.kingPos[color][0], this.kingPos[oppCol][0]];
+ if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+ for (let i = kingPos1 + 1; i < kingPos2; i++) {
+ if (this.board[i][m.end.y] != V.EMPTY) {
+ check[1]++;
+ break;
+ }
+ }
+ return check[1] == 1;
+ }
+ // Check already done:
+ return check[1] == 1;
+ });
+ }
+
+ getSlideNJumpMoves_([x, y], steps, oneStep) {
+ let moves = [];
+ outerLoop: for (let step of steps) {
+ const s = step.s;
+ let i = x + s[0];
+ let j = y + s[1];
+ while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
+ if (!step.onlyTake) moves.push(this.getBasicMove([x, y], [i, j]));
+ // NOTE: (bad) HACK here, since onlyTake is true only for Eagle
+ // capturing moves, which are oneStep...
+ if (!!oneStep || !!step.onlyTake) continue outerLoop;
+ i += s[0];
+ j += s[1];
+ }
+ if (V.OnBoard(i, j) && this.canTake([x, y], [i, j]) && !step.onlyMove)
+ moves.push(this.getBasicMove([x, y], [i, j]));
+ }
+ return moves;
+ }
+
+ static get steps() {
+ return (
+ Object.assign(
+ {
+ t: [
+ { s: [-1, 0] },
+ { s: [1, 0] },
+ { s: [0, -1] },
+ { s: [0, 1] },
+ { s: [-1, -1], onlyMove: true },
+ { s: [-1, 1], onlyMove: true },
+ { s: [1, -1], onlyMove: true },
+ { s: [1, 1], onlyMove: true }
+ ],
+ c: [
+ { s: [-1, 0], onlyMove: true },
+ { s: [1, 0], onlyMove: true },
+ { s: [0, -1], onlyMove: true },
+ { s: [0, 1], onlyMove: true },
+ { s: [-1, -1] },
+ { s: [-1, 1] },
+ { s: [1, -1] },
+ { s: [1, 1] }
+ ],
+ e: [
+ { s: [-1, 0], onlyMove: true },
+ { s: [1, 0], onlyMove: true },
+ { s: [0, -1], onlyMove: true },
+ { s: [0, 1], onlyMove: true },
+ { s: [-1, -1], onlyMove: true },
+ { s: [-1, 1], onlyMove: true },
+ { s: [1, -1], onlyMove: true },
+ { s: [1, 1], onlyMove: true },
+ { s: [-2, -1], onlyTake: true },
+ { s: [-2, 1], onlyTake: true },
+ { s: [-1, -2], onlyTake: true },
+ { s: [-1, 2], onlyTake: true },
+ { s: [1, -2], onlyTake: true },
+ { s: [1, 2], onlyTake: true },
+ { s: [2, -1], onlyTake: true },
+ { s: [2, 1], onlyTake: true }
+ ]
+ },
+ ChessRules.steps
+ )
+ );
+ }
+
+ getPotentialTowerMoves(sq) {
+ return this.getSlideNJumpMoves_(sq, V.steps[V.TOWER]);
+ }
+
+ getPotentialCardinalMoves(sq) {
+ return this.getSlideNJumpMoves_(sq, V.steps[V.CARDINAL]);
+ }
+
+ getPotentialEagleMoves(sq) {
+ return this.getSlideNJumpMoves_(sq, V.steps[V.EAGLE]);
+ }
+
+ getPotentialDukeMoves([x, y]) {
+ // Anything to capture around? mark other steps to explore after
+ let steps = [];
+ const oppCol = V.GetOppCol(this.getColor(x, y));
+ let moves = [];
+ for (let s of V.steps[V.ROOK].concat(V.steps[V.BISHOP])) {
+ const [i, j] = [x + s[0], y + s[1]];
+ if (
+ V.OnBoard(i, j) &&
+ this.board[i][j] != V.EMPTY &&
+ this.getColor(i, j) == oppCol
+ ) {
+ moves.push(super.getBasicMove([x, y], [i, j]));
+ }
+ else steps.push({ s: s, onlyMove: true });
+ }
+ if (steps.length > 0) {
+ const noncapturingMoves = this.getSlideNJumpMoves_([x, y], steps);
+ Array.prototype.push.apply(moves, noncapturingMoves);
+ }
+ return moves;
+ }
+
+ getPotentialKingMoves([x, y]) {
+ if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]);
+ // Empire doesn't castle:
+ return super.getSlideNJumpMoves(
+ [x, y],
+ V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+ "oneStep"
+ );
+ }
+
+ getPotentialSoldierMoves([x, y]) {
+ const c = this.getColor(x, y);
+ const shiftX = (c == 'w' ? -1 : 1);
+ const lastRank = (c == 'w' && x == 0 || c == 'b' && x == 9);
+ let steps = [];
+ if (!lastRank) steps.push([shiftX, 0]);
+ if (y > 0) steps.push([0, -1]);
+ if (y < 9) steps.push([0, 1]);
+ return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+ }
+
+ isAttacked(sq, color) {
+ if (color == 'b') return super.isAttacked(sq, color);
+ // Empire: only pawn and king (+ queen if promotion) in common:
+ return (
+ super.isAttackedByPawn(sq, color) ||
+ this.isAttackedByTower(sq, color) ||
+ this.isAttackedByEagle(sq, color) ||
+ this.isAttackedByCardinal(sq, color) ||
+ this.isAttackedByDuke(sq, color) ||
+ this.isAttackedBySoldier(sq, color) ||
+ super.isAttackedByKing(sq, color) ||
+ super.isAttackedByQueen(sq, color)
+ );
+ }
+
+ isAttackedByTower(sq, color) {
+ return super.isAttackedBySlideNJump(sq, color, V.TOWER, V.steps[V.ROOK]);
+ }
+
+ isAttackedByEagle(sq, color) {
+ return super.isAttackedBySlideNJump(
+ sq, color, V.EAGLE, V.steps[V.KNIGHT], "oneStep");
+ }
+
+ isAttackedByCardinal(sq, color) {
+ return super.isAttackedBySlideNJump(
+ sq, color, V.CARDINAL, V.steps[V.BISHOP]);
+ }
+
+ isAttackedByDuke(sq, color) {
+ return (
+ super.isAttackedBySlideNJump(
+ sq, color, V.DUKE,
+ V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"
+ )
+ );
+ }
+
+ isAttackedBySoldier([x, y], color) {
+ const shiftX = (color == 'w' ? 1 : -1); //shift from king
+ return super.isAttackedBySlideNJump(
+ [x, y], color, V.SOLDIER, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
+ }
+
+ updateCastleFlags(move, piece) {
+ // Only black can castle:
+ const firstRank = 0;
+ if (piece == V.KING && move.appear[0].c == 'b')
+ this.castleFlags['b'] = [8, 8];
+ else if (
+ move.start.x == firstRank &&
+ this.castleFlags['b'].includes(move.start.y)
+ ) {
+ const flagIdx = (move.start.y == this.castleFlags['b'][0] ? 0 : 1);
+ this.castleFlags['b'][flagIdx] = 8;
+ }
+ else if (
+ move.end.x == firstRank &&
+ this.castleFlags['b'].includes(move.end.y)
+ ) {
+ const flagIdx = (move.end.y == this.castleFlags['b'][0] ? 0 : 1);
+ this.castleFlags['b'][flagIdx] = 8;
+ }
+ }
+
+ getCurrentScore() {
+ // Turn has changed:
+ const color = V.GetOppCol(this.turn);
+ const lastRank = (color == 'w' ? 0 : 7);
+ if (this.kingPos[color][0] == lastRank)
+ // The opposing edge is reached!
+ return color == "w" ? "1-0" : "0-1";
+ if (this.atLeastOneMove()) return "*";
+ // Game over
+ const oppCol = this.turn;
+ return (oppCol == "w" ? "0-1" : "1-0");
+ }
+
+ static get VALUES() {
+ return Object.assign(
+ {},
+ ChessRules.VALUES,
+ {
+ t: 7,
+ e: 7,
+ c: 4,
+ d: 4,
+ s: 2
+ }
+ );
+ }
+
+ static get SEARCH_DEPTH() {
+ return 2;
+ }
+
+};
return evaluation;
}
+ static get SEARCH_DEPTH() {
+ return 3;
+ }
+
// Also no randomization here
static GenRandInitFen() {
return "rcnkncr/p1ppp1p/7/7/7/P1PPP1P/RCNKNCR w 0";
'k': 'k'
};
- let pieces = { w: new Array(8), b: new Array(8) };
- let flags = "";
- // Shuffle pieces on first (and last rank if randomness == 2)
- for (let c of ["w", "b"]) {
- if (c == 'b' && randomness == 1) {
- pieces['b'] = pieces['w'].map(p => piecesMap[p]);
- break;
- }
-
- // TODO: same code as in base_rules. Should extract and factorize?
-
- let positions = ArrayFun.range(8);
-
- let randIndex = 2 * randInt(4);
- const bishop1Pos = positions[randIndex];
- let randIndex_tmp = 2 * randInt(4) + 1;
- const bishop2Pos = positions[randIndex_tmp];
- positions.splice(Math.max(randIndex, randIndex_tmp), 1);
- positions.splice(Math.min(randIndex, randIndex_tmp), 1);
-
- randIndex = randInt(6);
- const knight1Pos = positions[randIndex];
- positions.splice(randIndex, 1);
- randIndex = randInt(5);
- const knight2Pos = positions[randIndex];
- positions.splice(randIndex, 1);
-
- randIndex = randInt(4);
- const queenPos = positions[randIndex];
- positions.splice(randIndex, 1);
-
- const rook1Pos = positions[0];
- const kingPos = positions[1];
- const rook2Pos = positions[2];
-
- pieces[c][rook1Pos] = "r";
- pieces[c][knight1Pos] = "n";
- pieces[c][bishop1Pos] = "b";
- pieces[c][queenPos] = "q";
- pieces[c][kingPos] = "k";
- pieces[c][bishop2Pos] = "b";
- pieces[c][knight2Pos] = "n";
- pieces[c][rook2Pos] = "r";
- if (c == 'b') pieces[c] = pieces[c].map(p => piecesMap[p]);
- else flags = V.CoordToColumn(rook1Pos) + V.CoordToColumn(rook2Pos);
- }
- // Add turn + flags + enpassant
+ const baseFen = ChessRules.GenRandInitFen(randomness);
return (
- pieces["b"].join("") +
- "/8/pppppppp/8/8/8/PPPPPPPP/" +
- pieces["w"].join("").toUpperCase() +
- " w 0 " + flags + " -"
+ baseFen.substr(0, 8).split('').map(p => piecesMap[p]).join('') +
+ // Skip 3 first rows + black castle flags
+ "/8/pppppppp" + baseFen.substr(19, 31) + " -"
);
}
return onlyMoves.concat(onlyTakes);
}
- getPotentialLancerMoves(sq) {
- const onlyMoves = this.getSlideNJumpMoves(
- sq,
- V.steps[V.KNIGHT],
- "oneStep",
- { onlyMove: true }
- );
- const onlyTakes = this.getSlideNJumpMoves(
- sq,
- V.steps[V.ROOK],
- null,
- { onlyTake: true }
- );
- return onlyMoves.concat(onlyTakes);
- }
-
getPotentialKheshigMoves(sq) {
- return this.getSlideNJumpMoves(
+ return super.getSlideNJumpMoves(
sq,
V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]),
"oneStep"
}
getPotentialYurtMoves(sq) {
- return this.getSlideNJumpMoves(
+ return super.getSlideNJumpMoves(
sq,
V.steps[V.BISHOP].concat([ [1, 0] ]),
"oneStep"
getPotentialKingMoves([x, y]) {
if (this.getColor(x, y) == 'w') return super.getPotentialKingMoves([x, y]);
// Horde doesn't castle:
- return this.getSlideNJumpMoves(
+ return super.getSlideNJumpMoves(
[x, y],
V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
"oneStep"
--- /dev/null
+import { ChessRules } from "@/base_rules";
+
+export class SynochessRules extends ChessRules {
+
+ // TODO
+
+};
isAttackedByPawn([x, y], color) {
// The pawn necessarily crossed the river (attack on king)
const shiftX = (color == 'w' ? 1 : -1); //shift from king
- for (let s of [[shiftX, 0], [0, 1], [0, -1]]) {
- const [i, j] = [x + s[0], y + s[1]];
- if (
- this.board[i][j] != V.EMPTY &&
- this.getColor(i, j) == color &&
- this.getPiece(i, j) == V.PAWN
- ) {
- return true;
- }
- }
- return false;
+ return super.isAttackedBySlideNJump(
+ [x, y], color, V.PAWN, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
}
knightStepsFromBishopStep(step) {
return evaluation;
}
+ static get SEARCH_DEPTH() {
+ return 2;
+ }
+
static GenRandInitFen() {
// No randomization here (TODO?)
return "rneakaenr/9/1c5c1/p1p1p1p1p/9/9/P1P1P1P1P/1C5C1/9/RNEAKAENR w 0";
projects / vchess.git / commitdiff
