Forced insufficient material#821
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…l` in terms of `opponentHasInsufficientMaterial`, and then update derived variant classes to implement their own `playerHasInsufficientMaterial`.
…(the 'player' in new positions) having insufficient mating material, then the opponent has insufficient mating material now.
…any non-captures first to falsify quicker.
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From the FIDE handbook:
If all of a player's legal moves reach a position where the opponent cannot win, then in the current position the opponent should be considered to have insufficient mating material. E.g., for this example, this PR would make the game be declared drawn if Black ran out of time.
Note that the changes made in the
variantsubfolder (commit f689821) are not strictly needed, but it's less confusing to now not have turn-agnostic logic anywhere.