TheaN: TheaN: 3/3
Once again.... Thursday? This is not a very varied solution and not hard to spot.
White: a4, b5, d6, f2, g3, h2, Nc4, Ra6, Qd5, Kg2
Black: a7, c5, f7, g6, h7, Nf5, Re8, Qd7, Kg7
1) White has a very healthy passed pawn extra.
2) Both White and Black have quite some space, but Black has a loose position and doesn't seem to be able to use his space.
3) Both White and Black have active pieces: all pieces, except for Ra6.
4) White's Ra6 is the only inactive piece otb, but it's not bad after a potential Rc6.
5) White controls the passed pawn d-file, but it´s blocked. Black's control of the open e-file is extremely crucial in this position.
6) White´s pawn chain is pretty secure, as the b-pawn (the extra pawn) supports a6. Only d6 is an isolated pawn, but dangerous and well defended. The King side is safe. Black's pawn chain on the queen side is rubbish having lost the b-pawn. Both a7 and c5 are very weak. The king side is identical to White's.
1) White can check with Qd4†, Qe5† and Qxf7†: important here is the power of the centralized Queen. Black can check with Ne3†, a royal fork, and Nh4†.
2) White's King seems safe but has relatively weak light squares around him. Black's King has the same problem around the black squares, but those aren't as weak as White's light squares.
3) White nor Black has loose pieces. All pieces are adequately defended. Pc5 is in though, and there's little Black can do.
4) White's Pd6 is pinned to Qd7, but it is not going to move for any reason. Black endures no pins.
5) White nor Black have potential skewers.
6) White nor Black have potential discoveries.
Candidates: Ne3†, Nh4†
The position's characteristics shows that White is actually more active and has a pawn more, so Black wants to attack the only weakness White has and use his own strength: light squares around the White King, and the Rook's e-file. This works perfectly with the clearance sac, actually leading to mate.
<40....Nh4†!> we enter, once again (see yesterday), a completely forced sequence here. All variations lead to mate.
<41.Kg1/Kh1 Re1‡ 0-1>
<41.Kf1 Qh3† 42.Kg1 Re1‡ 0-1>
<41.gxh4 Qg4† 42.Kf1 (Kh1 Re1‡ 0-1) Qh3† 43.Qg2 (Kg1 Re1‡ 0-1) Qd3† 44.Kg1 Re1† 45.Qf1 Qxf1‡ 0-1>