20 ( +1 | -1 ) "Chess" by Edward LaskerIf anyone has this book could you please look at section 50 and explain it to me. It is based on king/rook endings and under promoting a pawn to a rook instead of a queen . I cannot see the logic .
13 ( +1 | -1 ) "end-game study" by S.Saavedra . black king on h1,black rook on e5 ,white king on g6 , white pawn on f7. Black plays ...Re6 + . 2 Kg5 , Re5 + 3 Kg4 , Re4 + 4 Kg3 , Re1 5 Kf2 , Re5 6 Pf8 (R) !!?
24 ( +1 | -1 ) Because if the pawn is promoted to a queen black forces a draw by stalemate - see parrvert's post above. By promoting "only" to a rook white still gets the same mating threat, without allowing the stalemate option.