ABANDON

To give up all concern in a game or formally stating a voluntary decision to give up a game because of discouragement, weariness, distaste etc.

In this position, the Belgian player decided to stop the clocks, sign his score sheet and shake the hand of his opponent. At the postmortem, he discovered that after 36…Nxe5, 37. Rxe6 Nxd3 he had in fact, a winning the game…