http://en.lichess.org/training/58302
When I played out the puzzle with Stockfish Level 8 it suggests 4...Rxc3 (after 1...g5 2.Qxe3 Qf6+ 3.Kg1 Rxe3 4.h3) here the game: http://en.lichess.org/mYgwePkHAKAN yet the puzzle rejects that move and counts it as a loss.
What I played in the puzzle after 4.h3 Qxd4 5.Nb5 and now Qb2 the Puzzle says ''Good move but you can do better'' and only accepts the move 5...Qd2 as best move.
Ok, I'm not sure if 5...Qd2 is really better since 5...Qb2 forces simplification after 6.Rc3 Rxc3 7.Nxc3 Qxc3 8.hx4 it would look something like this: http://en.lichess.org/L4aF2IMqL9sC
But the point is that the puzzle counts SF8 move 4...Rxc3 as a loss.
When I played out the puzzle with Stockfish Level 8 it suggests 4...Rxc3 (after 1...g5 2.Qxe3 Qf6+ 3.Kg1 Rxe3 4.h3) here the game: http://en.lichess.org/mYgwePkHAKAN yet the puzzle rejects that move and counts it as a loss.
What I played in the puzzle after 4.h3 Qxd4 5.Nb5 and now Qb2 the Puzzle says ''Good move but you can do better'' and only accepts the move 5...Qd2 as best move.
Ok, I'm not sure if 5...Qd2 is really better since 5...Qb2 forces simplification after 6.Rc3 Rxc3 7.Nxc3 Qxc3 8.hx4 it would look something like this: http://en.lichess.org/L4aF2IMqL9sC
But the point is that the puzzle counts SF8 move 4...Rxc3 as a loss.