Mate In Four

Code

//Please feel welcome to copy this code for your own creations.
fromFen("r1k2Br1/1pp2p1p/p4n2/5q2/8/Q6P/PPP3P1/3RR1K1 w - - 0 1");
info("It's white's turn, and they can win in four moves.<br>Can you find them?");

let steps = [{
        square: "e1",
        move: "Re8+",
        counterMove: "Nxe8"
    }, {
        square: "d1",
        move: "Rd8+",
        counterMove: "Kxd8"
    }, {
        square: "a3",
        move: "Qe7+",
        counterMove: "Kc8"
    }, {
        square: "e7",
        move: "Qxe8#",
        counterMove: null
    },
];

onPieceClicked(function(squareName) {
    unhighlightAll();

    if(squareName == steps[0].square) {
        return true;
    } else {
        highlightSquareRed(squareName);
        return false;
    }
});

onMoveAttempted(function(san) {
    if(san == steps[0].move) {
        if(steps[0].counterMove != null) {
          setTimeout(function() {
            performMove(steps[0].counterMove);
            steps.shift();
          }, 500);
        } else {
          complete();
          info(" ");
        }

        return true;
    } else {
        return false;
    }
});