12999 Players currently online!
Man vs. Machine - good luck!
Turn-based games at any time!
Vote for the best move to win!
Do you have what it takes?
Backgammon, Yatzy, and more!
Sharpen your tactical vision!
Get advice and game insights!
Learn from top players & pros!
View millions of master games!
Your virtual chess coach!
Perfect your opening moves!
Test your skills vs. computer!
Find the right private coach!
Can you solve it each day?
Bring it all together!
Beginners, start here!
Make friends & play team games!
News from the world of chess!
Search all Chess.com members!
Find local clubs & events!
Who's the best of your friends?
Read what members are saying!
How long do you think this is? Not the longest practical game, but the longest possible. Any game will end up as a draw if each player plays 50 moves (so 100 half-moves altogether) and no captures or pawn moves are made. 15 captures are possible for each side, andeach pawn can move a maximum of 6 times before becoming a piece, which won't affect the 50 move rule. That gives a theoretical maximum of 96 pawn moves, but are they all possible? With captures, maybe.
If every pawn can make all its possible moves, and every piece is captured, then you have only the kings left, which is a draw under the rules (insufficient material), so the absolute theoretical maximum is 96 pawn moves, 15 captures for one side, 14 captures for the other side (making 125 50-move-clock-resetting-moves), 99 initial half moves before the first capture/pawn move (and this is probably the hardest time to avoid the threefold repetition rule, but it should be doable), 99 half-moves after each of the 125 clock resetting moves, and one last move, the final capture that just leaves the two kings (or if you prefer, the last move can just be any old move, and the 50 move rule applies).
Total of: 99+125+(125*99)+1=12500 half-moves. This is 6250 moves each. The longest games I've heard of have not gone for a tenth of this length.
The question is whether all the pawn moves and captures are possible. The captures would have to be done rather co-operatively, to get the pawns out of each other's way, but I think it can be done, partly because you can promote the pawns and use the newly promoted pieces for subsequent pawns.
Thoughts? Other than "OMG that would be a boring game", of course it would be, it wouldn't be chess, it would be the game of how to get the longest possible chess game, and it would neccesarily be co-operative. This is just an intellectual exercise.
Schu: also, if all the pawns can become pieces, this adds a further 16 pieces each to be taken.
yeah, again, thanks for the link :)
so clearly not all pawn moves and all captures are possible (well, they are, but some of the pawn moves have to be captures too, so they take up double), and for black not to be doing all the work, it can't be 99 half moves all the time. the link (and what it later links to) says 5946 moves overall. (11892 half-moves)
Marvellosity: the pawns were initially counted as pieces that can be taken. Changing them to pieces after promotion doesn't actually add pieces, just changes them.
Actually, the game can go on infinitley, someone has to claim a draw after 50 moves without a pawn move or capture.
chessy: well, yes, but firstly infinitley is not a word, and secondly, that leaves no interesting hypothetical debate ;)
Learning 1...e5--Best way?
by ylblai2 4 minutes ago
Playing 1. e4 as White
by dfgh123 9 minutes ago
A Request to the staff of Chess.com
by CrystalMoon 10 minutes ago
A well played game
by Thomas9400 10 minutes ago
Game vs. Master
by killerminidoxin 10 minutes ago
9/3/2015 - Keres - Petrosian
by sdtmcn 15 minutes ago
Moderator dictatorship just gets more incredible and frustrating!!!
by Lucien_Quest 16 minutes ago
Doubt On the Use of Computers
by AKAL1 17 minutes ago
best chess win?
by jetfighter13 19 minutes ago
what should i have done to convert to win
by MASS_ATTACKER 23 minutes ago
Why Join | Chess Topics |
Help & Support |
© 2015 Chess.com
• Chess - English
We are working hard to make Chess.com available in over 70 languages. Check back over the year as we develop the technology to add more, and we will try our best to notify you when your language is ready for translating!