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Given that we are experimenting here, probably let's restrict Black from making the extra move with the same pawn. all we want to do here is give Black nearly equal chances of beating White. Re your second point, fine (except that I believe that Black will always have space for an extra move). I suppose in the last stages, Black may be trying for Stalemate.
(nascondi) Se desideri trovare un avversario con una abilità di gioco pari alla tua, guarda nella pagina di valutazione del tipo di gioco desiderato e scegli un giocatore con un punteggio BKR vicino al tuo. (pauloaguia) (mostra tutti i suggerimenti)