Lesson No.017

ECO D40 White wins Opening: Intermediate Medium game, 44 moves Opening: Queen's Gambit Declined

Black

hgfe dcba

8765 4321

1234 5678

abcd efgh

White

Explanation

Game Moves

Show best moves

#	White	Best	Black	Best
1	d4	e4	d5	d5
2	c4	c4	c5	e6
3	Nf3	cxd5	Nf6	dxc4
4	Nc3	cxd5	e6	cxd4
5	e3	Bg5	Nc6	a6
6	Bd3	dxc5	a6	dxc4
7	cxd5	cxd5	c4	exd5
8	Bxc4	dxc6	exd5	exd5
9	Be2	Bb3	Bd6	Bd6
10	O-O	Bd2	O-O	O-O
11	Bd2	Bd2	Be6	Re8
12	Na4	a3	Qe7	Ne4
13	Rc1	Rc1	Rfe8	Ne4
14	Be1	Nc5	Ne4	Ne4
15	Nc3	Nd2	f5	Rad8
16	Bd2	Nd2	g5	Bf7
17	g3	Ne1	Rf8	Rf8
18	Ne1	Ne1	Rf6	Rad8
19	Ng2	Nd3	Kh8	Rh6
20	f4	f4	Rh6	Rh6
21	Nxe4	Be1	dxe4	fxe4
22	d5	d5	Kg8	gxf4
23	dxc6	dxe6	Rd8	g4
24	Qc2	c7	Bf7	Rc8
25	c7	cxb7	Bxc7	Bxc7
26	Qxc7	Qxc7	Qxc7	Qxc7
27	Rxc7	Rxc7	Rxd2	Rxd2
28	Rc8+	fxg5	Rd8	Kg7
29	Rxd8+	Rxd8+	Be8	Kg7
30	Rxe8+	Rxe8+	Kf7	Kg7
31	Rb8	fxg5	Rb6	Rb6
32	Rc1	fxg5	Kf6	Rxb2
33	b3	fxg5+	Rc6	a5
34	Rxc6+	fxg5+	bxc6	bxc6
35	Rb6	fxg5+	h6	h6
36	Rxa6	Rxa6	Ke6	Ke7
37	g4	Rxc6+	Kd6	fxg4
38	fxg5	gxf5	Ke5	hxg5
39	g6	gxh6	f4	h5
40	Nxf4	Nxf4	Kd6	Kd6
41	g7	g7	Kc7	Kc7
42	g8=Q	g8=Q	Kb7	Kb7
43	Ne6	Qa8+	c5	h5
44	Qa8#	Qa8#

Detailed Analysis

Evaluation Chart

Evaluation: How good the position is, in pawns (1 pawn = 1.0). + (blue) means you are better, − (red) means your opponent is. Capped at ±10. Touch a point to see the actual value.

◆ Mate: A position with checkmate in sight (shown at ±10). Touch a point to see the moves to checkmate (M3: you mate in 3, -M3: your opponent mates in 3).

Skill Radar

Estimated from engine evaluations. It may not match your actual strength.

How Scores Work: For each move, the winning chance (calculated from the evaluation) before and after the move is compared; the less it drops, the higher the move's accuracy. Each item is the average accuracy of its moves (out of 100). Items with fewer than 3 moves show (-) (Tactics is scored from a single move).

Opening	Moves 1 to 10
Tactics	Moves right after the opponent dropped their winning chance by 10% or more (did you take the chance?)
Strategy	Moves other than Opening, Endgame and Tactics
Endgame	Moves once both sides together have 8 or fewer pieces other than kings and pawns
Consistency	Share of all moves that did not drop the winning chance by 10% or more

* The win % and accuracy formulas are based on Lichess's calculations.

Win % and Accuracy

Win %: Your chance of winning (0–100), calculated from the evaluation after each move.

Accuracy: For each of your moves, a score (0–100) comparing your winning chance before and after the move. A move that keeps your winning chance scores 100.