Sprague-Grundy Theorem ·
XOR of Nimbers
un
seel
.com · Grundy values · mex · winning move
piles
4
XOR
0
verdict
—
move
—
game pile (Nim heap)
Grundy value g = mex
winning move · shrink pile
XOR = 0 → P-position
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.com · Sprague-Grundy Theorem