Bishop+King can win?

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yusuf_prasojo

Today I played and I had trouble with clock so at the end I tried to capture all the pawns so my opponent will have only a bishop, which I thought wouldn't be sufficient to win. So I captured the last pawn and my opponent captured my rook leaving my opponent with only king and bishop, but he won on time. Is this correct (FIDE rule)?

Dragec

If you are referring to a game where your opponent had a king + lone bishop, and you had a king + 3 pawns, then yes, you lost the game.

It is correct in FIDE, article 6.9. :

http://www.fide.com/component/handbook/?id=124&view=article

the mate is possible, note that it doesn't have to be probable.

 

jtt96

Thats crazy. I think they should change the rule to 'forced mate' rather than probabble mate.

zezpwn44

But then you could intentionally run out of time any time there was no forced mate, rather than having to accurately defend.  Rule's fine, in my opinion.  Serious games are usually G/120 SD 60, so you just have to not run out of time =p

Bizarrebra

Hi,

If I remember well, there are some playsites where if you run out of time but your opponent has no sufficient mating material, then it's a draw.

yusuf_prasojo

OMG! What a rule! So if I didn't have those pawns then I wouldn't possibly make mistakes, and it would be a draw? If so, how about King+Knight? There is similar situation I believe?

Matthew11

if you and your opponent both have material and you run out of time you lose, even if mate is not possible

Silfir
uhohspaghettio wrote:
Matthew11 wrote:

if you and your opponent both have material and you run out of time you lose, even if mate is not possible


Mate is ALWAYS possible when you and your opponent have material.


Wrong!

Dunno if I should bother linking the FIDE rules if people don't bother reading up on their own, but the relevant question is not "Is there sufficient material" or something. Material is not what it's about. It's "Can any legal sequence of moves lead to checkmate for the side that did not run out of time." If the answer is yes, it's lost on time, regardless of how crazy that sequence would have to be.

On standard time control OTB without increments, if you have three minutes or less on the clock, you can claim a draw on the basis that your opponent has no winning plan beyond playing on to run you out of time. Your position would be an example of that. Unfortunately, in live chess you don't have that opportunity; it also doesn't go for blitz OTB. I don't think in rapid either, but not sure. In any match with increments it should be easy to keep on making moves until threefold repetition or 50-move rule.

Keep in mind, trying to win positions like the above on time in case of severe opponent time trouble is rather the standard in rated blitz. Not much you can do to prevent it except not get into time trouble.

By the way, if no sequence of legal moves can lead to checkmate for either side, it's an automatic draw, and this is very much possible in cases where both sides have lots of material - that definition includes stalemate positions and stuff like the following:

Dragec

Another example where mate is impossible while there is enough mating material:

Joel2718

nice example dragec, but I just feel like I have no point out, that position isn't even in possible in any amount of legal moves (edit: read my next post! ).  Unless you allow both queens to capture their own pieces and then take themselves off the board.  But i find this thread to be interesting, it turns out creating chess rules is a lot more complicated than it may seem.  I bet there's lots of examples where you wouldn't realize that its 100% impossible for a checkmate to occur, and other examples where you think the drawn but a mating combination exists.  I guess the hard part would be to somehow enumerate all possibilities but this is far beyond the power of any computers we have. 

Joel2718

Wait a second dragec, I realized that the position certainly is possible afterall, as knights could definitely make it beyond enemies lines and find some knight path to capture all pieces except a bishop and then get captured.  Still an interesting question :)

IpswichMatt
Joel2718 wrote:

Wait a second dragec, I realized that the position certainly is possible afterall, as knights could definitely make it beyond enemies lines and find some knight path to capture all pieces except a bishop and then get captured.  Still an interesting question :)


Even if Knights couldn't jump the position is still possible.

STPAULSCHESSKING
Dragec wrote:

Another example where mate is impossible while there is enough mating material:

 

actually there is the en passant move to stop the soon to be draw

Kraine04

Surely any position that is possible win should be won if opponents clock runs out. (Even if it requires a lot of bad moves from your opponent). Say for example Bishop + King can beat Pawn + King so if player with pawn runs out of time, player with bishop should be declared winner.