const c = this.turn;
const forward = (c == 'w' ? -1 : 1);
const steps = V.steps[V.ROOK].concat([[forward, 1], [forward, -1]]);
const c = this.turn;
const forward = (c == 'w' ? -1 : 1);
const steps = V.steps[V.ROOK].concat([[forward, 1], [forward, -1]]);