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[1d-chess] Make AI force a 6-move mate instead of a 5-move #9

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[1d-chess] Make AI force a 6-move mate instead of a 5-move #9

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2 changes: 1 addition & 1 deletion 1dchess/chess.html
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ <h1> 1D-Chess </h1>
Play as white against the AI. You might initally find it more difficult than expected, but assming optimal play, is there a forced win for white?
<br>
<br>
Mouse over to reveal answer: <span class="spoiler-box">Try this line: N4 N5, N6 K7, R4 K6, R2 K7, R5++</span>
Mouse over to reveal answer: <span class="spoiler-box">Try this line: N4 N5, N6 K7, R4 N3, K2 N5, N8 K8, R5++</span>
</p>

<h2> Rules </h2>
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24 changes: 8 additions & 16 deletions 1dchess/js/chess-ai.js
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Expand Up @@ -62,15 +62,15 @@ function minimax(gameState, a=-1, b=1, depth=0) {
switch (gameState["gameResult"]["winner"]){
case "white":
//console.log("white win");
return 1;
return 1 - depth * 0.001;
case "black":
//console.log("black win");
return -1
return -1 + depth * 0.001;
case "draw":
return 0;
}
}
if (canClaimDraw(gameState["pieceList"]) && gameState["bestMove"] != "None") {
if (canClaimDraw(gameState["pieceList"]) && depth > 0) {
// console.log("1 knight draw");
return 0;
}
Expand Down Expand Up @@ -121,12 +121,8 @@ function minimax(gameState, a=-1, b=1, depth=0) {
childGameState["depth"] = gameState["depth"] + 1;

let childValue = minimax(childGameState, a, b, depth+1);
if(childValue == 1) {
gameState["bestMove"] = movePair;
return childValue
}
value = Math.max(value, childValue);
if (value == childValue) {
if (childValue > value) {
value = childValue;
gameState["bestMove"] = movePair;
}
a = Math.max(a, value);
Expand Down Expand Up @@ -173,15 +169,11 @@ function minimax(gameState, a=-1, b=1, depth=0) {
childGameState["turn"] = otherColor(childGameState["turn"]);

let childValue = minimax(childGameState, a, b, depth+1);
if(childValue == -1) {
gameState["bestMove"] = movePair;
return childValue
}
value = Math.min(value, childValue);
if (value == childValue) {
if (childValue < value) {
value = childValue;
gameState["bestMove"] = movePair;
}
b = Math.max(b, value);
b = Math.min(b, value);
if (b <= a){
break;
}
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