IM Jack Rudd wrote:
Christopher Kreuzer wrote: more complex positions such as K+B+B vs K+N
This one is, in general, winning for the bishops - although not always within 50 moves.
Yes, sorry. I should have made clear that this one is winning for the two bishops. I gave it as an example of the hardest position I could think of where the result might not generally be known even by stronger players. Well, there are more complex tablebase positions still, but they are far less likely to occur.
I would be very reluctant to intervene (or see others intervene) in any such games until the players themselves had had a chance to play lots of moves and either agree a result or realise themselves that they don't know how to make progress. Even then, it would be best to suggest gently "(not much time left, play on for a bit longer) if you feel you can't make progress, you can offer your opponent a draw". Best to stop the clocks first before saying anything like that.
How common are the positions with bare king and queen against rook and minor pieces, and how many minor pieces do you need before the side with the queen is forced to lose? e.g. K+Q vs K+R+B+B or vs K+R+R+B or vs K+R+R+B+N. The latter must be a win surely?
Win vs K+Q: K+R+R+B and K+R+R+N
Draw vs K+Q: K+R+B+B and K+R+B+N and K+R+N+N