Important to revisit every move

Chess Checks

Open positions having plenty of pieces on board in a chess game are the most dangerous ones as they offer plenty of scope for both players. After every move, there are hidden threats and danger and many times some hidden resources. 

Therefore it is very important to check each and every capture and every move needs fresh consideration and calculation. Generally these positions are more difficult to play during time trouble where the players have to move fast and have less time to think.

In the game which follows, the bishop pair by both players with the Queens and rooks on board offers opportunity for both but Black commits a tactical blunder and ends up losing the game.

White: Peter Svidler (2684) – Black: Vitall Golod (2568)
European Cup final, Bugojno, 1999
The Ruy-Lopez
1.e4 e52.Nf3 Nc6 3.Bb5
The Ruy Lopez, one of the most popular Openings in chess since the 16th century. It is also known as the Spanish Opening
3. ..a64.Ba4 Nf6 5.0–0 Nxe4. Black decides to accept the pawn and play
6.d4 b57.Bb3 d5 8.dxe5 Be6 9.Nbd2 Bc5 10.Qe2. White can also play 10.Nxe4 or 10.c3 or 10.Qe1
10...Nxd2. If 10...Bf511.a4 Rb8 11...b4 12.Nxe4 Bxe4 13.Be3 Bxe3 14.Qxe3 0–0 15.Ng5) 12.axb5axb5 13.Nxe4 dxe4
11.Bxd20–0 12.Rad1. Also played previously are 12.Bg5; 12.Rfd1; 12.h3; 12.c3; and 12.a4
12...Be7. If 12...Ne713.Be3 Bxe3 14.Qxe3 c6
13.h3. If 13.Be3Na5 14.Nd2 c5
13...Na7. This is one of the most analyzed Openings in chess and Black played a novelty here. If13...Kh814.c3 Na5 15.Bc2 c5 16.b3 Nc6
14.c3. If 14.Nd4c5 15.Nxe6 fxe6 16.c3
14...c5
Black is keen on pushing his queen side pawns
15.Bf4Nc6 16.Bc2. If 16.Rd2 Na5;16.Qd2 Qc7 17.Bxd5 Rad8 is better for black
16...Qd7. Black can also consider 16. ..Re8
17.Qd3. Doubling forces on the diagonal
17. ..g6. More or less forced!
18.Qe3 . The bishop battery and the Queen are targeting the Kingside
18. ..d419.cxd4 Nxd4. If 19...cxd420.Nxd4
20.Nxd4cxd4 21.Rxd4 Bc5 22.Rfd1. If 22.Rxd7Bxe3 23.Bxe3 Bxd7
22...Qc7. A mistake! Black would have been better off after 22...Bxd423.Rxd4 Qc7 24.Be4 (24.Bg5 Qxc2 25.Bf6 Rac8)
23.Be4. A good move! If  23.Qc3 b4 24.Rxb4 Rac8 25.Re4 (25.Rd2 Bxb426.Qxb4 Qc4) 25...Bxf2+ 26.Kxf2 Qb6+ 27.Qd4 Rxc2+ 28.Rd2 Rxd2+ 29.Bxd2Qxd4+ 30.Rxd4 f6(30...Bxa2 31.Ra4)
23...Bxd4 24.Rxd4 Rad8 25.Rd6 a5. Black should have looked at 25...Rxd6 26.exd6 Qd7 27.Qd4 f5 (27...f628.Bh6 Rf7 29.Qb6)  
26.a3 b427.axb4 axb4 28.Qd4 Rc8 29.Bc6.
This is not the right move! White could have played  29.Bh6 Rfd8 (29...Qc5 30.Bxf8 Kxf8 (30...Qc1+31.Kh2 Rxf8 32.Bd5)  30.Qxb4 Rb8 (30...Rxd631.e­xd6) 31.Qh4 f5 32.Rxe6 (32.Qf6 Rxd6 33.exd6 Qxb7 34.Qxe6+ Qf7 35.Qe3)32...Rxb7

Diagram1

29...Rb8. A tactical blunder which tilts the game heavily in White’s favour. If 29...Qe7 30.Bh6 Rfd831.h4 (31.Qf4 f6 32.Rxd8+ Qxd8 33.Ba4) 31...f6 32.Bf3. There are many possibilities like
a)32.exf6Rxd6  33.f7+ Qxf7 34.Qxd6 b3  b)32.Bd5 Bxd5
 30.Bh6Rfc8. Another mistake in a lost position! Black should have played 30...Qe731.Bxf8 Kxf8 32.Bd7
31.Qh4. And Black resigned for if 31. .. f5 (31...Qxc6 32.Rxc6 Rxc6 33.Qf6)32.Rxe6 and it is all over.  1–0

Diagram 2

Black to play and win (1.  .. Nxd32.Qxd3 Bxh2+ and Black wins).