Fix HalfChess, more random Loser initial position, continue draft of Ultima

[vchess.git] / public / javascripts / variants / Loser.js

diff --git a/public/javascripts/variants/Loser.js b/public/javascripts/variants/Loser.js
index da4999f..6a322b9 100644 (file)
--- a/public/javascripts/variants/Loser.js
+++ b/public/javascripts/variants/Loser.js
@@ -142,4 +142,60 @@ class LoserRules extends ChessRules
        {
                return - super.evalPosition(); //better with less material
        }
+
+       static GenRandInitFen()
+       {
+               let pieces = { "w": new Array(8), "b": new Array(8) };
+               // Shuffle pieces on first and last rank
+               for (let c of ["w","b"])
+               {
+                       let positions = _.range(8);
+
+                       // Get random squares for bishops
+                       let randIndex = 2 * _.random(3);
+                       let bishop1Pos = positions[randIndex];
+                       // The second bishop must be on a square of different color
+                       let randIndex_tmp = 2 * _.random(3) + 1;
+                       let bishop2Pos = positions[randIndex_tmp];
+                       // Remove chosen squares
+                       positions.splice(Math.max(randIndex,randIndex_tmp), 1);
+                       positions.splice(Math.min(randIndex,randIndex_tmp), 1);
+
+                       // Get random squares for knights
+                       randIndex = _.random(5);
+                       let knight1Pos = positions[randIndex];
+                       positions.splice(randIndex, 1);
+                       randIndex = _.random(4);
+                       let knight2Pos = positions[randIndex];
+                       positions.splice(randIndex, 1);
+
+                       // Get random square for queen
+                       randIndex = _.random(3);
+                       let queenPos = positions[randIndex];
+                       positions.splice(randIndex, 1);
+
+                       // Random square for king (no castle)
+                       randIndex = _.random(2);
+                       let kingPos = positions[randIndex];
+                       positions.splice(randIndex, 1);
+
+                       // Rooks positions are now fixed
+                       let rook1Pos = positions[0];
+                       let rook2Pos = positions[1];
+
+                       // Finally put the shuffled pieces in the board array
+                       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';
+               }
+               return pieces["b"].join("") +
+                       "/pppppppp/8/8/8/8/PPPPPPPP/" +
+                       pieces["w"].join("").toUpperCase() +
+                       " 0000"; //add flags (TODO?!)
+       }
 }