?! Threatens to win a pawn at the expense of the rooks retreat squares.
21... Nf6d5
!! Now the bullets will fly. The rook has no safe square. Rxd3 and Re7 looses the trade. Re4 looses the bishop after 22... Bxg5 23 Rxe8 Rxe8 if white tries to win the bishop back with 24 Nxg5 then white looses the other bishop 24... Rxe2. Best is the two pawn loss of 22. Rxd3 cxd3 Bxd3.
22. Re3e5
?? Looses the rook because of the over worked knight on f3. one variation goes 22... Nxe5 23. Nxe5 Bxg5 24. Bxc4 Nf6
22... Nd3xe5 23. Bg5xe7
Black trying to do an in between move here of 23... Nxf3+ does not help because after 24.Bxf3 the Knight on d5 is pinned to the rook and will loses it
23... Re8xe7
black accepts the trade of bishops and prepares for a trade of knights.
24. Nf3xe5 Re7xe5 25. Be2xc4 Nd5b6 26. Bc4b5
?? Protecting the e8 square from the doubled rooks hangs the bishop and the doubled rooks are not threatening yet because the bishop is guarding the f1 square.
