Solution of puzzle is Rd3, but Rg3 seems perfectly valid to me. How lichess take consider of multiple solutions ?
Nxg4 attacks queen after Rg3
Rd3 is better because after ...Nxg4, the g file rook can capture while the d file rook maintains pressure on the queen.
If Rg3 Nxg4 Rxg4, black's queen can slip away
If Rg3 Nxg4 Rxg4, black's queen can slip away
And even though Rg3 wins a piece, it's still not enough for an advantage since white was down a piece at the start of the puzzle.
You can press space after the puzzle to start computer analysis and see why the alternatives are worse.
You can press space after the puzzle to start computer analysis and see why the alternatives are worse.
Thanks for your answers ! I had missed the Nxg4 problem.
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