Euler’s Knights — Chess Against a Mathematical Ghost

Field notes

The variant replaces the ordinary knight with a nightrider-like piece that may continue along the same sequence of leaps when each landing square is empty. The page says this makes the opening sharper because starting knights can reach the opponent’s second rank, and it describes an engine using iterative deepening, pruning, move-ordering heuristics, and tapered evaluation terms. A rules switch permits comparison with orthodox chess.