To understand the depth number, this is how deep in the move tree the model looks forward in order to evaluate positions. I think depth 22 corresponds to 22 ply

To understand the depth number, this is how deep in the move tree the model looks forward in order to evaluate positions. I think depth 22 corresponds to 22 ply ie 11 moves by each player. At each depth it might evaluate 8-10 candidate moves or so, so a depth of 48 is clearly vastly stronger, not just "a bit more than twice as strong" which it might sound like. I'm a very average chess player, and there are moves I play that stockfish at depth 16 things are a blunder that at depth 32 it thinks are a brilliancy. These are typically things in openings I play a lot where I've had a chance to do some homework and learn the best moves on a high depth.