MESON Chess Problem Database
Problem Display
PID: 467 (3B2B1/3n1KN1/R2Np2k/4pp2/8/4P2p/2Q3bR/5rr1 w - - 0 1)
Leaver, Rev DC
The Observer, 1956
#2
9 + 9
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Sdxf5#
- 1...Rb1
- 2.Sdxf5#
- 1...Rc1
- 2.Sdxf5#
- 1...Rd1
- 2.Sdxf5#
- 1...Re1
- 2.Sdxf5#
- 1...Bh1
- 2.Rxh3#
- 1...Bf3
- 2.Sdxf5#
- 1...Be4
- 2.Rxh3#
- 1...Bd5
- 2.Rxh3#
- 1...Bc6
- 2.Rxh3#
- 1...Bb7
- 2.Rxh3#
- 1...Ba8
- 2.Rxh3#
- 1...f4
- 2.Sdf5#
- 2.Qg6#
- 2.Qh7#
- 1...Ra1
- Tries
- 1.Qxg2?
- threat
- 2.Bg5#
- 2.Rxh3#
- 2.Qxh3#
- 1...Rxg2
- 2.Rxh3#
- 1...Rf3
- 2.Bg5#
- 1...Rf4
- 2.Bg5#
- 1...Rh1
- 2.Bg5#
- 2.Qxh3#
- 2.Qg5#
- 2.Qg6#
- 1...Sf6!
- threat
- 1.Qxg2?
- Keys
- 1.Qxf5!
- threat
- 2.Bg5#
- 1...Rxf5+
- 2.Sdxf5#
- 1...exf5
- 2.Sdxf5#
- 1...Bh1
- 2.Rxh3#
- 1...Bf3
- 2.Qh7#
- 1...Be4
- 2.Rxh3#
- 1...Bd5
- 2.Rxh3#
- 1...Bc6
- 2.Rxh3#
- 1...Bb7
- 2.Rxh3#
- 1...Ba8
- 2.Rxh3#
- 1...Sf6
- 2.Qg6#
- threat
- 1.Qxf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 3
- REMOVED MATES = 5
- Sets
- R(a);N_GUARD::S(E),XP(f)
- B(c);N_GUARD::R(B),XP(d)
- B(c);S_CUTR(a)::S(E),XP(f)
- Tries
- Try
- Q(A);XB(c)
- Threat
- DUALS(3)
- Vars
- R(b);XQ(A)::R(B),XP(d)
- R(a);::B(H)
- Refutation
- S(i);
- Try
- Actual
- Q(A);P_SPINQ(A),XP(f)
- Threat
- B(H)
- Vars
- R(a);CHECK,XQ(A)::S(E),XR(a)
- P(g);XQ(A)::R(D)+S(E),DCHECK,XP(g)
- B(c);N_GUARD::R(B),XP(d)
- B(c);N_PINQ(A)::QAR1(A)
- S(i);N_PINQ(A)::QAR1(A)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).