Cool idea.
Magnus Persson wrote:
Valkyria computes AMAF win rates for all moves including those that are
pruned or illegal in the position. What I noticed is that in cases of
critical semeais the AMAF values of moves that are for example illegal
can get very high since they only get legal when you win the semeai and
thus win the game
Therefore Valkyria takes the AMAF values of moves that cannot be played
yet, and try to find approach moves that will enable playing them and
replaces the AMAF values of the approach move with the AMAF value of the
illegal move if it is higher.
This is a costly computation so it is only done if the position has been
visited several times.
Without this AMAF-hack Valkyria sometimes has a problem finding F1. It
also seems to take a longer time to find F1 in all cases where does find
it.
I have not yet tested the effect on the playing strength from this.
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