15990 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?
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!
Ah yes, that was extremely difficult. At first glance, you don't really see any particular problems with the study. But the retrocage is indeed a tough one to release. However, those empty squares allow for an extra flexibility to exploit.
Seemingly, there is no way to release the retrocage. But there is one approach - black retracts Qh1, which means there was a piece on h2. Now, whichever piece it was, even a knight, it cannot escape. That means the piece was captured within the retrocage. And that means that it must be a white piece, because black has no pieces to spare.
However, the black queen cannot capture that piece (let's call it "X") withought cheking the white king. So, another black piece captured X (let's call it "Y)". But now again, the white queen cannot capture Y, because black has no pieces to spare. This means that Y captured X and escaped. Obviously, Y can only be a black knight. Now, this black knight can only capture X on g2, because h2 is unreachable. This means that X is a white rook and we made some progress.
Moving on. The only move that can lock the retrocage is e3. This is important to recognize - those two black rooks have zero flexibility if e3 was played before f4 and g5. That means that the black queen was on h1 (with a white rook on h2), the black king on g1 (with another piece on g2), and the other white rook on e1 (with another piece on f1). So the next step is to realize which pieces were on g2 and f1.
The piece that was on f1 suffers the same fate as the white rook on h2. It cannot escape. This means that it was captured. It can only be captured by the black king. Mystery solved - a white knight.
Final step, which piece is on g2? Here, I first considered a black knight, which later jumps to e1 once it is available, then white moves his rook to g2, then the black knight captures the rook and escapes quickly to be captured by white's a pawn axb8=B. However, this strategy is not good enough, because if the black knight is on g2 when white plays e3, black has no moves and have to waste his tempo moves - playing c6, c5 etc... and at the end, he is short of tempo. This is where I got stuck.
Finally I realized there is a double maneuver involved. The piece that was on g2 was in fact a white knight, which later escapes and get captured by black's a pawn axb2 and b1=N. This leaves black later with the tempo moves c6 etc... The black knight enters the retrocage to capture the white rook on g2, then returns to be captured by white's a pawn. Some accuracy is required in the final pawn moves. At the end of the day, black must have promoted to a knight.
Are tactics really the way to go?
by Warbringer33 3 minutes ago
Do You Try to Draw as Black on Principle?
by chesster3145 3 minutes ago
Annoying E4 to E5 by White in Sicilian
by chessmicky 10 minutes ago
Post your best miniatures here
by Andre_Harding 11 minutes ago
Any dark red stained chess sets?
by cgrau 17 minutes ago
Vera Menchik´s Tactics (4 Tactics)
by SilentKnighte5 17 minutes ago
Wooden Chess set
by loubalch 27 minutes ago
ask a professional chess player anything
by gssleader 37 minutes ago
What if you went to a live tournament and no one came except for you?
by Martin0 39 minutes ago
5/25/2015 - Mate or Queen
by bigluigi 41 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!