Sir , at 52:17 time , why can’t B make a move from 66 to 61 (66-5) .Since 61 is in the form of (8K + something ) and there is a possibility to win right !
Keepers -losers Game ( Gametheory webinar)
For given n, you check for its nearest multiple of (a+b)
So for a=2,b=6, n=66
You check 8*k <=66, so you calculate for 64.
Now for 64 , you check if you can go for 65(only option) but since a is 2 , you cant go 66->65. Hence you lose the game.
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