Wythoff Game is where there are n-piles of stones and two players. Players take turn removing m stones from one pile, or m stones from more than one pile. The player who picks up the last stone wins.
In the game of Nim, a player can only pick from one pile at a turn. The nimnumber is the binary sum of the size of the piles. If the nimnumber is equal to zero, the current configuration is said to be a cold-position, the next player will lose if the other player plays optimally.
My question is there an equivalent use of the nimnumber for Wythoff's game?