12791 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!
1Checkmate, 2Material, 3Force, 4Time, 5Space/Mobility. Order of importance. Checkmate is not within the search horizon for either side. To be precise you're trading a Bishop and Knight for a Rook and Pawn. So you're essentially equal on Material value alone.
However Look at the other factors of the trade: The Black Knight on g4 puts a Force of 1 on h6,f6,e5,e3,f2, and h2 The Black Bishop on c5 puts a Force of 1 on a7,b6,d4,e3,f2,a3,b4,d6,e7,&f8 Where as the White Pawn on f2 only puts a Force of one on e3 and g3, and the White Rook only puts a Force of one on f2, d1 and e1. Not a good trade.
Time? Without the trade Black has 3 minor pieced developed to White's 4, White is castled, and black is not. Just a little behind but its Black's move and he can develop a 4th piece or castle. WITH the trade, Black has ONE minor piece developed to White's 4. MUCH worse. Time says NO! (time also says you shouldn't have moved the g8 Knight twice)
Space/Mobility? Black has 47 moves availble to him prior to initiating the trade. White: 32 After the trade: Black 35, White 41. I'm not going to add up forces on each square to find out which side controls more squares pre-trade and post-trade, but you could. My intuition says white would gain ground.
Remember to compare to the other legal moves you could make that may give you better checkmate, material, force, time, or space/mobility. There's many better moves, and IN THIS situation, that trade is not justified. Now in the endgame or elsewhere the same criteria may yield different results. But at least I hope I've helped you see why that is a bad trade in your example.
Also on your first example, the position is NOT illegal, its black to move, he's in check and must get out, but white is not in check, I do not see anything "illegal" about the position.
If I recall correctly there are two dark squared bishops and no pawn could have promoted to them, thus, a position that cannot occur in a game and is therefore illegal.
A good point
A simple way of taking a bad opponnets rook in 4 moves, emphasis on bad.
In post #29 you're simply winning the f7-pawn (what in the world?).
your diagrams are illegal positions
but some good points although I question your most recent illustration which is a bit random
well, so are you
No, generally when you swap two minor pieces for a rook you have put yourself in a losing game.. In the diagram you swapped a rook and a pawn for two minor pieces and even with the extra pawn you put yourself in a losing game. Remember a knight is generally worth maybe 3.2 pawns and a bishop is generally worth 3.3 pawns compared to a rook worth about 5.0 pawns.
aha, more numerology!
yes we seem to have gone full circle
Stuff Non-Chess Players Say
by dragonair234 a few minutes ago
Compañero de ajedrez / Chess partner
by skillerhero 3 minutes ago
Bobby Fischer's best friend was schizophrenic
by livat01 3 minutes ago
Positional vs Romantic Chess
by logozar 7 minutes ago
Does move g5 by black end the game?
by D-mate19 9 minutes ago
Are you supposed to accept a rematch offer on live chess?
by Ziryab 13 minutes ago
Chess.com Teaching Profile
by Robert0905 18 minutes ago
Please elaborate on these chess terms
by D-mate19 19 minutes ago
10/4/2015 - Forced Mate
by robertkeitz111 31 minutes ago
No overview current games in Online chess
by Icarus11342 33 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!