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Please click on - select exercise - and choose some exercises. In the textarea you may then double-click on any line with a FEN string (looking like r1bk3r/pppq1ppp/5n2/4N1N1/2Bp4/Bn6/P4PPP/4R1K1 w - - 0 1 ) and the according position will appear on the board. The computer evaluation is shown in the eval-bar above and the eval display beneath it. For aesthetical reasons, evaluation in favour of White is shown in green, for Black in PURPLE. You may and should play the position against the computer engine (stockfish.js). The solution is usually shown in the line below the FEN string. 6k1/P7/8/8/8/8/p7/6K1 b - - 1 1 ionosactive/next_test_17.html like promotion:

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