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I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.

As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.

Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame Carlsen had with the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP), where he had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were cases where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.

I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.

As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.

Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame where Carlsen had the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP). He had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were cases where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.

I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.

As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.

Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame Carlsen had the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP), where he had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were squares where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.

I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.

As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.

Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame Carlsen had with the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP), where he had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were cases where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.

I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.

As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.

Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame Carlsen had with the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP), where he had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were cases where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.

I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.

As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.

Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame Carlsen had the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP), where he had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were squares where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.