MESON Chess Problem Database
Problem Display
PID: 39984 (KN1b4/1nB2B2/p6r/r6R/1pNkbRq1/1Q3p2/1Pn2P2/8 w - - 0 1)
Butcher, FG
The Observer, 1958
(First published on Sun May 11 1958)
#2
10 + 11
| 136 | Problem Observer | 1972 |
| 56 | The Problemist | 2003 |
| 136 | Problem Observer | 2007 |
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Rd5#
- 1...Ra2
- 2.Rd5#
- 1...Ra3
- 2.Rd5#
- 1...Ra4
- 2.Rd5#
- 1...Rd5
- 2.Rxd5#
- 1...Rc6
- 2.Sxc6#
- 1...Rh7
- 2.Sc6#
- 1...Rh8
- 2.Sc6#
- 1...Bf6
- 2.Sc6#
- 1...Sa1
- 2.Qd1#
- 2.Qe3#
- 1...Se1
- 2.Qe3#
- 1...Sa3
- 2.Qd1#
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 2.fxe3#
- 1...Sc5+
- 2.Rd5#
- 1...Sd6+
- 2.Sc6#
- 1...Ra1
- Tries
- 1.Sd2?
- threat
- 2.Qc4#
- 1...Sc5+
- 2.Rd5#
- 2.Qd5#
- 1...Sd6+
- 2.Sc6#
- 1...Qe6
- 2.Sxf3#
- 1...Rc6
- 2.Sxc6#
- 1...Sa3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 2.fxe3#
- 1...Rc5!
- threat
- 1.Sa3?
- threat
- 2.Sxc2#
- 2.Qc4#
- 1...Sc5+
- 2.Rd5#
- 2.Qd5#
- 1...Sd6+
- 2.Sc6#
- 1...Qxh5
- 2.Qc4#
- 1...Qxf4
- 2.Qc4#
- 1...Rxa3
- 2.Rd5#
- 2.Qc4#
- 2.Qd5#
- 1...Raxh5
- 2.Qc4#
- 1...Rhxh5
- 2.Qc4#
- 1...Sxa3
- 2.Qd1#
- 2.Qe3#
- 1...bxa3
- 2.Qc4#
- 2.Qc3#
- 1...Qf5
- 2.Qc4#
- 1...Qg5
- 2.Qc4#
- 1...Rd5
- 2.Rxd5#
- 2.Qc4#
- 2.Qxd5#
- 1...Re5
- 2.Qc4#
- 1...Rf5
- 2.Qc4#
- 1...Rg5
- 2.Qc4#
- 1...Bg5
- 2.Qc4#
- 1...Qe6
- 2.Sxc2#
- 1...Rc6
- 2.Sxc6#
- 1...Sa1
- 2.Qd1#
- 2.Qc4#
- 2.Qe3#
- 1...Se1
- 2.Qc4#
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 2.fxe3#
- 1...Rc5!
- threat
- 1.Se3?
- threat
- 2.Sxc2#
- 2.Qc4#
- 1...Sc5+
- 2.Rd5#
- 2.Qd5#
- 1...Sd6+
- 2.Sc6#
- 1...Qxh5
- 2.Qc4#
- 1...Qxf4
- 2.Qc4#
- 1...Raxh5
- 2.Qc4#
- 1...Rhxh5
- 2.Qc4#
- 1...Sxe3
- 2.Qxe3#
- 2.fxe3#
- 1...Qf5
- 2.Qc4#
- 1...Qg5
- 2.Qc4#
- 1...Rd5
- 2.Rxd5#
- 2.Qc4#
- 2.Qxd5#
- 1...Re5
- 2.Qc4#
- 1...Rf5
- 2.Qc4#
- 1...Rg5
- 2.Qc4#
- 1...Bg5
- 2.Qc4#
- 1...Qe6
- 2.Sxc2#
- 1...Rc6
- 2.Sxc6#
- 1...Sa1
- 2.Qd1#
- 2.Qc4#
- 1...Se1
- 2.Qc4#
- 1...Sa3
- 2.Qd1#
- 1...Rc5!
- threat
- 1.Sxa5?
- threat
- 2.Rd5#
- 2.Qc4#
- 2.Qd5#
- 1...Sxa5+
- 2.Rd5#
- 2.Qd5#
- 1...Sc5+
- 2.Rd5#
- 2.Qd5#
- 1...Sd6+
- 2.Sac6#
- 2.Sbc6#
- 2.Rd5#
- 2.Qd5#
- 1...Qxh5
- 2.Qc4#
- 1...Qxf4
- 2.Qc4#
- 1...Rxh5
- 2.Qc4#
- 1...Qf5
- 2.Qc4#
- 1...Qg5
- 2.Qc4#
- 1...Bg5
- 2.Qc4#
- 2.Qd5#
- 1...Qd7
- 2.Qc4#
- 1...Rc6
- 2.Saxc6#
- 2.Sbxc6#
- 2.Rd5#
- 2.Qd5#
- 1...Rd6
- 2.Qc4#
- 1...Sa3
- 2.Rd5#
- 2.Qd1#
- 2.Qd5#
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 2.fxe3#
- 1...Qe6!
- threat
- 1.Sd2?
- Keys
- 1.Se5!
- threat
- 2.Qc4#
- 1...Sc5+
- 2.Qd5#
- 1...Sd6+
- 2.Sec6#
- 1...Kc5
- 2.Qc4#
- 1...Rc5
- 2.Qd3#
- 1...Qe6
- 2.Sxf3#
- 1...Rc6
- 2.Sexc6#
- 1...Sa3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- threat
- 1.Se5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 5
- REMOVED MATES = 9
- Sets
- R(g);N_GUARD::R1(F)
- R(g);N_GUARD::R1(F),XR(g)
- R(i);N_GUARD::S(J),XR(i)
- R(i);N_GUARD::S(J)
- B(k);S_CUTR(i)::S(J)
- S(a);N_GUARD::QAB1(C)
- S(j);CHECK,S_CUTR(g)::R1(F)
- S(j);CHECK,S_CUTR(i)::S(J)
- Tries
- Try
- S(D);
- Threat
- QAR1(C)
- Vars
- S(j);CHECK,S_CUTR(i)::S(J)
- Q(f);N_GUARD::S(D),XP(b)
- R(i);N_GUARD::S(J),XR(i)
- S(a);N_GUARD::QAB1(C)
- Refutation
- R(g);
- Try
- S(D);
- Threat
- DUALS(2)
- Vars
- S(j);CHECK,S_CUTR(i)::S(J)
- Q(f);XR(F)::QAR1(C)
- Q(f);N_SPINB(e),XR(E)::QAR1(C)
- R(g);XR(F)::QAR1(C)
- R(i);XR(F)::QAR1(C)
- Q(f);::QAR1(C)
- R(g);::QAR1(C)
- B(k);::QAR1(C)
- Q(f);::S(D),XS(a)
- R(i);N_GUARD::S(J),XR(i)
- Refutation
- R(g);
- Try
- S(D);
- Threat
- DUALS(2)
- Vars
- S(j);CHECK,S_CUTR(i)::S(J)
- Q(f);XR(F)::QAR1(C)
- Q(f);N_SPINB(e),XR(E)::QAR1(C)
- R(g);XR(F)::QAR1(C)
- R(i);XR(F)::QAR1(C)
- Q(f);::QAR1(C)
- R(g);::QAR1(C)
- B(k);::QAR1(C)
- Q(f);::S(D),XS(a)
- R(i);N_GUARD::S(J),XR(i)
- S(a);::QAR1(C)
- S(a);OGATE::QAR(C)
- Refutation
- R(g);
- Try
- S(D);XR(g)
- Threat
- DUALS(3)
- Vars
- Q(f);XR(F)::QAR1(C)
- Q(f);N_SPINB(e),XR(E)::QAR1(C)
- R(i);XR(F)::QAR1(C)
- Q(f);::QAR1(C)
- R(i);::QAR1(C)
- Refutation
- Q(f);
- Try
- Actual
- S(D);
- Threat
- QAR1(C)
- Vars
- S(j);CHECK,S_CUTR(g)::QAR1(C)
- S(j);CHECK,S_CUTR(i)::S(D)
- K(d);N_SPINB(e),S_FLIGHT::QAR1(C)
- R(g);SBLOCK::QAR1(C)
- Q(f);N_GUARD::S(D),XP(b)
- R(i);N_GUARD::S(D),XR(i)
- S(a);N_GUARD::QAB1(C)
- S(a);N_GUARD::QAB1(C),XS(a)
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