MESON Chess Problem Database
Problem Display
PID: 87834 (3r2Bb/1nB5/R6r/1PkN1Pq1/P2R4/3pQ3/1K2N1b1/8 w - - 0 1)
Sydenham, Colin Peter
The Problemist, 1992
#2
11 + 8
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Qh4
- 2.Qc1#
- 1...Qf6
- 2.Qc1#
- 1...Qe7
- 2.Qc1#
- 1...Qg3
- 2.Qc1#
- 1...Qg4
- 2.Qc1#
- 1...Qxf5
- 2.Qc1#
- 1...Qh5
- 2.Qc1#
- 1...Qg6
- 2.Qc1#
- 1...Qg7
- 2.Qc1#
- 1...Qxg8
- 2.Qc1#
- 1...Rh1
- 2.Rc6#
- 1...Rh2
- 2.Rc6#
- 1...Rh3
- 2.Rc6#
- 1...Rh4
- 2.Rc6#
- 1...Rh5
- 2.Rc6#
- 1...Rc6
- 2.Rxc6#
- 1...Rf6
- 2.Rf4#
- 1...Rh7
- 2.Rc6#
- 1...Bxd4+
- 2.Qxd4#
- 1...Bf6
- 2.Rc6#
- 1...Sd6
- 2.Bb6#
- 2.Rc6#
- 1...dxe2
- 2.Qc3#
- 1...d2
- 2.Qa3#
- 2.Qc3#
- 1...Qh4
- Tries
- 1.Sc1?
- threat
- 2.Sb3#
- 2.Sxd3#
- 1...Qxe3
- 2.Sb3#
- 1...Qxf5
- 2.Sb3#
- 1...Bxd5
- 2.Sxd3#
- 1...Bf1
- 2.Sb3#
- 1...Be4
- 2.Sb3#
- 1...Sa5
- 2.Sxd3#
- 1...d2
- 2.Sb3#
- 2.Sd3#
- 2.Qc3#
- 1...Bxd4+!
- threat
- 1.Ba5?
- threat
- 2.Bb4#
- 1...Bxd4+
- 2.Qxd4#
- 1...Sxa5!
- threat
- 1.Rf6?
- threat
- 2.Bb6#
- 2.Rf4#
- 1...Qxe3
- 2.Bb6#
- 1...Qxf6
- 2.Qc1#
- 1...Qxg8
- 2.Bb6#
- 2.Qc1#
- 1...Rxf6
- 2.Rf4#
- 1...Rxd5
- 2.Bb6#
- 1...Rxg8
- 2.Bb6#
- 1...Qf4
- 2.Bb6#
- 2.Rxf4#
- 1...Qg3
- 2.Bb6#
- 2.Qc1#
- 1...Rh3
- 2.Bb6#
- 2.Rc6#
- 1...Rd6
- 2.Rf4#
- 1...Re8
- 2.Bb6#
- 1...Be4
- 2.Bb6#
- 1...Bxf6!
- threat
- 1.Qe7+?
- 1...Rhd6
- 2.Bb6#
- 2.Rc6#
- 1...Rdd6
- 2.Bb6#
- 2.Rc6#
- 1...Sd6
- 2.Bb6#
- 2.Rc6#
- 1...Qxe7!
- 1...Rhd6
- 1.f6?
- threat
- 2.Rf4#
- 2.Rc6#
- 1...Qxe3
- 2.Rc6#
- 1...Qxf6
- 2.Qc1#
- 1...Qxg8
- 2.Rc6#
- 2.Qc1#
- 1...Rxf6
- 2.Rf4#
- 1...Rxd5
- 2.Rc6#
- 1...Rxg8
- 2.Rc6#
- 1...Bxd5
- 2.Rf4#
- 1...Bxf6
- 2.Rc6#
- 1...Rd6
- 2.Rf4#
- 1...Qf4
- 2.Rxf4#
- 2.Rc6#
- 1...Qg3
- 2.Rc6#
- 2.Qc1#
- 1...Qe5
- 2.Rc6#
- 2.Qc1#
- 1...Rh3
- 2.Rc6#
- 1...Re8
- 2.Rc6#
- 1...Be4
- 2.Rc6#
- 1...Sa5
- 2.Rf4#
- 1...Qxd5!
- threat
- 1.Sc1?
- Keys
- 1.Sf6!
- threat
- 2.Bb6#
- 2.Rc4#
- 1...Qxf6
- 2.Qc1#
- 1...Qxg8
- 2.Bb6#
- 1...Rxf6
- 2.Rc4#
- 1...Rxd4
- 2.Qxd4#
- 1...Rxg8
- 2.Sd7#
- 2.Bb6#
- 2.Rf4#
- 1...Bxf6
- 2.Bb6#
- 1...Rd5
- 2.Rc6#
- 1...Rd6
- 2.Rc4#
- 1...Bd5
- 2.Rf4#
- threat
- 1.Sf6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 4
- REMOVED MATES = 17
- Sets
- Q(d);N_GUARD::QAR(C)
- Q(d);N_GUARD,XP(H)::QAR(C)
- Q(d);N_GUARD,XB(K)::QAR(C)
- R(e);N_GUARD::R1(I)
- R(e);N_GUARD::R1(I),XR(e)
- R(e);N_PINR(E)::QAB(C)+R(E)
- B(h);CHECK,OGATE,P_SPINB(h),XR(E)::QAB1(C),XB(h)
- B(h);S_CUTR(e)::R1(I)
- P(b);OGATE,XS(B)::QAR2(C)
- Tries
- Try
- S(B);
- Threat
- DUALS(2)
- Vars
- Q(d);XQ(C)::S(B)
- Q(d);XP(H)::S(B)
- B(a);XS(G)::S(B),XP(b)
- B(a);::S(B)
- S(f);::S(B),XP(b)
- Refutation
- B(h);CHECK,P_SPINB(h),XR(E)
- Try
- B(J);
- Threat
- B(J)
- Vars
- B(h);CHECK,OGATE,P_SPINB(h),XR(E)::QAB1(C),XB(h)
- Refutation
- S(f);XB(J)
- Try
- R(I);N_SPINR(E)
- Threat
- DUALS(2)
- Vars
- Q(d);XQ(C)::B(J)
- Q(d);N_GUARD,P_PINR(E),XR(I)::QAR(C)
- R(e);XR(I)::QAB(C)+R(E)
- R(g);XS(G)::B(J)
- R(g);XB(K)::B(J)
- R(g);::QAB(C)+R(E)
- R(g);::B(J)
- B(a);::B(J)
- Refutation
- B(h);P_PINR(E),XR(I)
- Try
- Q(C);CHECK
- Refutation
- Q(d);XQ(C)
- Try
- P(H);N_SPINR(E)
- Threat
- DUALS(2)
- Vars
- Q(d);XQ(C)::R1(I)
- Q(d);N_GUARD,P_PINR(E),XP(H)::QAR(C)
- R(e);XP(H)::QAB(C)+R(E)
- R(g);XS(G)::R1(I)
- R(g);XB(K)::R1(I)
- B(a);XS(G)::QAB(C)+R(E)
- B(h);P_PINR(E),XP(H)::R1(I)
- R(g);::QAB(C)+R(E)
- R(e);::R1(I)
- R(g);::R1(I)
- B(a);::R1(I)
- S(f);::QAB(C)+R(E)
- Refutation
- Q(d);XS(G)
- Try
- Actual
- S(G);N_SPINR(E)
- Threat
- DUALS(2)
- Vars
- Q(d);N_GUARD,P_PINR(E),XS(G)::QAR(C)
- Q(d);XB(K)::B(J)
- R(e);XS(G)::QAB(C)+R(E),DCHECK
- R(g);OGATE,P_SPINR(g),XR(E)::QAB1(C),XR(g)
- B(h);P_PINR(E),XS(G)::B(J)
- R(g);S_CUTB(a)::R1(I)
- R(g);::QAB(C)+R(E),DCHECK
- B(a);S_CUTR(g)::QAB(C)+R(E)
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).