| 1 | import { ChessRules } from "@/base_rules"; |
| 2 | |
| 3 | export class KothRules extends ChessRules { |
| 4 | filterValid(moves) { |
| 5 | if (moves.length == 0) return []; |
| 6 | const color = this.turn; |
| 7 | const oppCol = V.GetOppCol(color); |
| 8 | return moves.filter(m => { |
| 9 | this.play(m); |
| 10 | // Giving check is forbidden as well: |
| 11 | const res = !this.underCheck(color) && !this.underCheck(oppCol); |
| 12 | this.undo(m); |
| 13 | return res; |
| 14 | }); |
| 15 | } |
| 16 | |
| 17 | getCurrentScore() { |
| 18 | // Turn has changed: |
| 19 | const color = V.GetOppCol(this.turn); |
| 20 | if ( |
| 21 | [3,4].includes(this.kingPos[color][0]) && |
| 22 | [3,4].includes(this.kingPos[color][1]) |
| 23 | ) { |
| 24 | // The middle is reached! |
| 25 | return color == "w" ? "1-0" : "0-1"; |
| 26 | } |
| 27 | if (this.atLeastOneMove()) return "*"; |
| 28 | // Stalemate (will probably never happen) |
| 29 | return "1/2"; |
| 30 | } |
| 31 | |
| 32 | evalPosition() { |
| 33 | // Count material: |
| 34 | let evaluation = super.evalPosition(); |
| 35 | // Ponder with king position: |
| 36 | return ( |
| 37 | evaluation/5 + |
| 38 | ( |
| 39 | Math.abs(this.kingPos["w"][0] - 3.5) + |
| 40 | Math.abs(this.kingPos["w"][1] - 3.5) |
| 41 | ) / 2 - |
| 42 | ( |
| 43 | Math.abs(this.kingPos["b"][0] - 3.5) + |
| 44 | Math.abs(this.kingPos["b"][1] - 3.5) |
| 45 | ) / 2 |
| 46 | ); |
| 47 | } |
| 48 | }; |