Achuvettan vs LPSupi: game review

30.Rd5 is a mistake: White's winning chances go from 50% to 34%.

• Black answers 30…c5, which takes d4 away from the rook on d5.
• Better was 30.Kd3 (−0.05).

Better: 30.Kd3 prepares Rg1 and Rg4. Engine line: 30…Kc6 31.Rg1 f4 32.Rg4 Rb8 33.Kc2 fxe3 34.fxe3 Kb5 (−0.05).

31.Rxe5 is a blunder: White's winning chances go from 43% to 20%.

• Black answers 31…dxe5, which takes the rook on e5.
• After dxe5, Black wins 5 points of material within 2 moves.
• Better was 31.Rd4 (−0.72), which attacks the a4 pawn, which is undefended.

Better: 31.Rd4 gets the rook out of the way of …Rxd5. Engine line: 31…Rb5 32.Ke1 Rxb2 33.Rxa4 Rb5 34.Kd1 (−0.72).

33…Kc6! The only good move here: every alternative is clearly worse.

• The next best move, 33…c6, would drop Black's winning chances from 88% to 50% (0.00).
• 33…Kc6 prepares …h5 and …Kb5.
• The engine's plan continues with …h5 and …Kb5: this move is the first step.
• White answers 34.h4, leaving Black with an isolated pawn on h5.
• After 34.h4 h5 35.Kd4 Kb5 36.Ke5 Kc4 37.Kxf5 Kb3 38.Kxe4 Kxb2 39.Kf5, Black is a pawn down (−6.02).

37…c5+! The only good move here: every alternative is clearly worse.

• Check, and White has only one legal reply.
• The next best move, 37…Ke6, would drop Black's winning chances from 92% to 50% (0.00).
• 37…c5+ gives check, leaving one reply.
• White answers 38.Kc4, leaving Black with an isolated pawn on c5.
• Engine line: 38.Kc4 Kc6 39.b4 cxb4 40.cxb4 a3 (−6.81).

38…Kc6! The only good move here: every alternative is clearly worse.

• The next best move, 38…Ke5, would drop Black's winning chances from 91% to 10% (+5.83).
• 38…Kc6 stops Kb5.
• White was threatening Kb5, winning a pawn, picking it up with 39.Kxc5. Kc6 takes care of it.
• The engine's plan continues with …a3 and …Kb6: this move is the first step.
• White answers 39.b4, leaving Black with an isolated pawn on a3.
• Engine line: 39.b4 a3 40.b5+ Kb6 41.Kb3 a4+ 42.Kxa3 Kxb5 43.Kb2 (−6.75).

• Both sides followed opening theory up to 10.Bh2: 19 moves in all, 10 by White and 9 by Black.
• Black left the book with 10…a5. In 48 games from this position, strong players played 10…e5 (85%) or 10…Ne4 (8%).
• The main line goes on 10…e5 11.dxe5.
• From here White scored 61% in those games, with 11% drawn.