Hi.
This pin practice lichess.org/analysis/standard/q5k1/5pp1/8/1pb1P3/2p4p/2P2r1P/1P3PQ1/1N3R1K_b_-_-_0_1?color=black
1... Rxh3+ 2. Kg1 Rg3 3. Qxg3 hxg3 4. b4 Bxf2+
The fourth black move, I got to the point when the analysis engine said black can mate white in 6, but after that, it changed. Was the engine referencing the "main line"? Because the difference was the b4 response from white, the "main line" said knight d2.
This pin practice lichess.org/analysis/standard/q5k1/5pp1/8/1pb1P3/2p4p/2P2r1P/1P3PQ1/1N3R1K_b_-_-_0_1?color=black
1... Rxh3+ 2. Kg1 Rg3 3. Qxg3 hxg3 4. b4 Bxf2+
The fourth black move, I got to the point when the analysis engine said black can mate white in 6, but after that, it changed. Was the engine referencing the "main line"? Because the difference was the b4 response from white, the "main line" said knight d2.