Take a look at this position. White to move. How would you evaluate it? What is the best move?
Latest version of the strongest chess engine in the world - Stockfish at depth 28 show +1.4 score and suggest Qd4 for the next move. But do you agree with it?
Are you ready to get surprised?
Here is the magic move - Qh8+ and mate in 8. Note how chess engine change its mind immediately after move was done.
No, it doesn't mean that Stockfish is weak. It also doesn't mean that engines are bad at calculation. The point is you should not rely on programs entirely. Don't forget about good old brain.
Here are 2 more interesting positions. At the position №1 engine shows -1.7 score at Depth = 22. At the position №2 score = 0 (Stockfish think that it is a dead draw at Depth = 22). In both cases evaluation is incorrect.
White to move on both puzzles. Find the best move. Answer is on the bottom of this page.
FEN: 8/PBn5/5k2/7p/5p2/7p/3K4/8 w - - 0 1
FEN: 4rb2/1p1q1ppk/p1n1p2p/2p1Pn2/3PNR2/2P2K2/P2QBP2/6R1 w - - 0 1
FEN: r5k1/p1p1K2p/1p5p/1N6/4P1PB/3P1b2/P1P2p2/Q3q3 w - - 0 1
Tools for position analysis
There are special programs to analyze games and positions - chess engines. Typically, these programs are console applications without an interface. Therefore, in addition to the engine itself, you still need a GUI (graphic user interface). Here are a few variants you can try:
1. Online analysis board at lichess. It is convenient
First variant is simple. You don't need to download anything. Just open the link and use it. Don't forget to enable chess engine (turn on slider in the top-right corner (see picture):
Also you can enable up to 5 best moves and 5 lines (principal variations) in the analysis options. There are a few other parameters, which you can configure on this panel. Press button in the bottom-right corner to open it.
Second variant is a bit more complicated (however, it gives you more possibilities - for example, you can use any engine you want, which sometimes very useful in position analysis). You need to download program called Arena Chess GUI and install it on you computer.
Try to copy this PGN and paste it at lichess here. Now you can analyse great game of the grandmasters with the engine and convenient board!
Update [22 Feb 2021]
Here is one more interesting position. Black to play. FEN: 1r3rk1/p4pb1/3pp2p/2n1n2q/4PBp1/1NN1Q3/PPP2PP1/3R1RK1 b - - 0 1
Chess engine (Stockfish 13 and older versions) shows +- equal score for the position. However, there is a continuation, which leads black to win. Check the study below (you can press arrows left and right to navigate through the moves).