MESON Chess Problem Database
Problem Display
PID: 67609 (8/2pBrP1K/2N2R2/3kPpPQ/2RN4/3P4/1p6/q6b w - - 0 1)
Valtonen, Kari
US Problem Bulletin, 1995
#2
11 + 7
SOLUTION
- SOUND
- Sets
- 1...Qa2
- 2.Qxh1#
- 1...Qa3
- 2.Qxh1#
- 1...Qa4
- 2.Qxh1#
- 1...Qa5
- 2.Qxh1#
- 1...Qa6
- 2.Qxh1#
- 1...Qa7
- 2.Qxh1#
- 1...Qa8
- 2.Qxh1#
- 1...Rxe5
- 2.Sb4#
- 1...Re6
- 2.Bxe6#
- 1...Rxf7+
- 2.Qxf7#
- 1...Bf3
- 2.Qxf3#
- 1...b1S
- 2.Qxh1#
- 1...b1B
- 2.Qxh1#
- 1...Qa2
- Tries
- 1.Sc2?
- threat
- 2.Se3#
- 2.S2b4#
- 1...Rxf7+
- 2.Qxf7#
- 1...Rxe5
- 2.S2b4#
- 2.S6b4#
- 1...b1Q
- 2.Se3#
- 1...b1R
- 2.Se3#
- 1...Qc1
- 2.S2b4#
- 1...Qg1
- 2.S2b4#
- 1...Qa3
- 2.Se3#
- 2.Qxh1#
- 1...Qa4
- 2.Se3#
- 2.Qxh1#
- 1...Qa5
- 2.Se3#
- 2.Qxh1#
- 1...Qa7
- 2.S2b4#
- 2.Qxh1#
- 1...f4
- 2.S2b4#
- 1...Qe1!
- threat
- 1.Se2?
- threat
- 2.Sc3#
- 2.Sf4#
- 1...Rxf7+
- 2.Qxf7#
- 1...b1Q
- 2.Sf4#
- 1...b1S
- 2.Sf4#
- 2.Qxh1#
- 1...b1B
- 2.Sf4#
- 2.Qxh1#
- 1...b1R
- 2.Sf4#
- 1...Qe1
- 2.Sf4#
- 1...Qf1
- 2.Sc3#
- 1...Qa3
- 2.Sf4#
- 2.Qxh1#
- 1...Qa5
- 2.Sf4#
- 2.Qxh1#
- 1...f4
- 2.Sc3#
- 2.Sxf4#
- 1...Qc1!
- threat
- 1.Sb3?
- threat
- 2.Rd4#
- 2.Rc5#
- 1...Rxf7+
- 2.Qxf7#
- 1...b1Q
- 2.Rc5#
- 1...b1S
- 2.Rc5#
- 2.Qxh1#
- 1...b1B
- 2.Rc5#
- 2.Qxh1#
- 1...b1R
- 2.Rc5#
- 1...Qc1
- 2.Rd4#
- 1...Qa3
- 2.Rd4#
- 2.Qxh1#
- 1...Qa4
- 2.Rc5#
- 2.Qxh1#
- 1...Qa5
- 2.Rd4#
- 2.Qxh1#
- 1...Qa7
- 2.Qxh1#
- 1...Qg1!
- threat
- 1.Sf3?
- threat
- 2.Sb4#
- 2.Sxe7#
- 1...Rxf7+
- 2.Qxf7#
- 1...Rxe5
- 2.Sb4#
- 1...Rxd7
- 2.Sb4#
- 1...Bxf3
- 2.Qxf3#
- 1...b1Q
- 2.Sxe7#
- 1...b1R
- 2.Sxe7#
- 1...Qe1
- 2.Sxe7#
- 1...Qa4
- 2.Sxe7#
- 1...Qa5
- 2.Sxe7#
- 1...Re6
- 2.Sb4#
- 2.Bxe6#
- 1...Re8
- 2.Sb4#
- 1...Qa3!
- threat
- 1.Sxf5?
- threat
- 2.Se3#
- 2.Sfxe7#
- 1...Rxf7+
- 2.Qxf7#
- 1...Rxe5
- 2.Sb4#
- 1...Rxd7
- 2.Se3#
- 1...Qc1
- 2.Sfxe7#
- 1...Qe1
- 2.Sfxe7#
- 1...Qg1
- 2.Sfxe7#
- 1...Qa3
- 2.Se3#
- 2.Qxh1#
- 1...Qa7
- 2.Sfxe7#
- 2.Qxh1#
- 1...Re6
- 2.Se3#
- 2.Bxe6#
- 1...Re8
- 2.Se3#
- 1...Be4!
- threat
- 1.Se6?
- threat
- 2.Sf4#
- 2.Sxc7#
- 2.Rd4#
- 2.Rc5#
- 1...Rxe6
- 2.Bxe6#
- 1...Rxd7
- 2.Sf4#
- 2.Rc5#
- 1...b1Q
- 2.Sf4#
- 2.Sxc7#
- 2.Rc5#
- 1...b1S
- 2.Sf4#
- 2.Sxc7#
- 2.Rc5#
- 2.Qxh1#
- 1...b1B
- 2.Sf4#
- 2.Sxc7#
- 2.Rc5#
- 2.Qxh1#
- 1...b1R
- 2.Sf4#
- 2.Sxc7#
- 2.Rc5#
- 1...Qc1
- 2.Sxc7#
- 2.Rd4#
- 1...Qf1
- 2.Sxc7#
- 2.Rd4#
- 2.Rc5#
- 1...Qg1
- 2.Sf4#
- 2.Sxc7#
- 1...Qa3
- 2.Sf4#
- 2.Sxc7#
- 2.Rd4#
- 2.Qxh1#
- 1...Qa4
- 2.Sf4#
- 2.Sxc7#
- 2.Rc5#
- 2.Qxh1#
- 1...Qa5
- 2.Sf4#
- 2.Rd4#
- 2.Qxh1#
- 1...Qa7
- 2.Sf4#
- 2.Qxh1#
- 1...f4
- 2.Sxf4#
- 2.Sxc7#
- 2.Rd4#
- 2.Rc5#
- 1...Rxf7+!
- threat
- 1.Rxf5?
- threat
- 2.Sb4#
- 2.Sxe7#
- 1...Rxf7+
- 2.Qxf7#
- 1...Rxd7
- 2.Sb4#
- 1...b1Q
- 2.Sxe7#
- 1...b1R
- 2.Sxe7#
- 1...Qe1
- 2.Sxe7#
- 1...Qa3
- 2.Qxh1#
- 1...Qa4
- 2.Sxe7#
- 2.Qxh1#
- 1...Qa5
- 2.Sxe7#
- 2.Qxh1#
- 1...Re6
- 2.Sb4#
- 2.Bxe6#
- 1...Re8
- 2.Sb4#
- 1...Rxe5!
- threat
- 1.Re6?
- threat
- 2.Sb4#
- 2.Sxe7#
- 1...Rxe6
- 2.Bxe6#
- 1...Rxd7
- 2.Sb4#
- 1...b1Q
- 2.Sxe7#
- 1...b1R
- 2.Sxe7#
- 1...Qe1
- 2.Sxe7#
- 1...Qa3
- 2.Qxh1#
- 1...Qa4
- 2.Sxe7#
- 2.Qxh1#
- 1...Qa5
- 2.Sxe7#
- 2.Qxh1#
- 1...Re8
- 2.Sb4#
- 1...Rxf7+!
- threat
- 1.Sc2?
- Keys
- 1.Sb5!
- threat
- 2.Sc3#
- 2.Sxc7#
- 1...Rxf7+
- 2.Qxf7#
- 1...Rxd7
- 2.Sc3#
- 1...b1Q
- 2.Sxc7#
- 1...b1S
- 2.Sxc7#
- 2.Qxh1#
- 1...b1B
- 2.Sxc7#
- 2.Qxh1#
- 1...b1R
- 2.Sxc7#
- 1...Qc1
- 2.Sxc7#
- 1...Qe1
- 2.Sxc7#
- 1...Qa3
- 2.Sxc7#
- 2.Qxh1#
- 1...Qa5
- 2.Qxh1#
- 1...Qa7
- 2.Sc3#
- 2.Qxh1#
- threat
- 1.Sb5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 11
- Sets
- Q(a);N_GUARD::QAB(F),XB(b)
- R(g);N_PINP(J),SBLOCK,XP(D)::S(G)
- R(g);N_GUARD,N_PINP(J)::B(I),XR(g)
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- B(b);N_GUARD::QAB(F),XB(b)
- P(c);S_CUTQ(a)::QAB(F),XB(b)
- Tries
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- P(c);::S(C)
- Q(a);::S(C)
- P(e);::S(C)
- Refutation
- Q(a);
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- P(c);::S(C)
- Q(a);::S(C)
- Refutation
- Q(a);
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- P(c);::R1(B)
- Q(a);::R1(B)
- Q(a);N_GUARD::QAB(F),XB(b)
- Refutation
- Q(a);
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- R(g);N_PINP(J),XP(D)::S(G)
- R(g);XB(I)::S(G)
- B(b);OGATE,XS(C)::QAB(F),XB(b)
- P(c);::S(G),XR(g)
- Q(a);::S(G),XR(g)
- R(g);N_PINP(J)::S(G)
- Refutation
- Q(a);
- Try
- S(C);XP(e)
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- R(g);N_PINP(J),SBLOCK,XP(D)::S(G)
- R(g);XB(I)::S(C)
- Q(a);::S(C),XR(g)
- R(g);N_PINP(J)::S(C)
- Refutation
- B(b);P_PINS(C)
- Try
- S(C);
- Threat
- DUALS(4)
- Vars
- R(g);N_PINP(J),OGATE,XS(C)::B(I),XR(g)
- Refutation
- R(g);CHECK,XP(J)
- Try
- R(H);XP(e)
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- R(g);XB(I)::S(G)
- P(c);::S(G),XR(g)
- Q(a);::S(G),XR(g)
- Q(a);N_GUARD::QAB(F),XB(b)
- R(g);N_PINP(J)::S(G)
- Refutation
- R(g);N_PINP(J),P_SPINR(g),XP(D)
- Try
- R(H);
- Threat
- DUALS(2)
- Vars
- R(g);N_PINP(J),OGATE,XR(H)::B(I),XR(g)
- R(g);XB(I)::S(G)
- P(c);::S(G),XR(g)
- Q(a);::S(G),XR(g)
- Q(a);N_GUARD::QAB(F),XB(b)
- R(g);N_PINP(J)::S(G)
- Refutation
- R(g);CHECK,XP(J)
- Try
- Actual
- S(C);
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,OGATE,XP(J)::QAB(F),XR(g)
- R(g);XB(I)::S(C)
- P(c);::S(C),XP(f)
- Q(a);::S(C),XP(f)
- Q(a);N_GUARD::QAB(F),XB(b)
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).