MESON Chess Problem Database
Problem Display
PID: 59060 (8/8/8/4npN1/3p3p/p2P2kp/K1R4b/2BQ4 w - - 0 1)
Brotherton, David WA
1st HM., The Observer, 1961
#2
6 + 8
| 136 | Problem Observer | 2005 |
SOLUTION
- SOUND
- Sets
- 1...Bg1
- 2.Qxg1#
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...Bg1
- Tries
- 1.Ka1?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...a2!
- 1...Sxd3
- 1.Kb1?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...a2+!
- 1...Sxd3
- 1.Kxa3?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...Sc4+!
- 1...Sxd3
- 1.Kb3?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...a2!
- 1...Sxd3
- 1.Be3?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...dxe3!
- 1...Sxd3
- 1.Rb2?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...axb2!
- 1...Sxd3
- 1.Rd2?
- 1...Kf4
- 2.Rg2#
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...Bg1!
- 1...Kf4
- 1.Rf2?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...Kxf2!
- 1...Sxd3
- 1.Qe2?
- 1...Sxd3
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Se4#
- 1...Bg1!
- 1...Sxd3
- 1.Qf1?
- threat
- 2.Qxh3#
- 2.Qf4#
- 1...Sxd3
- 2.Qxh3#
- 2.Qf3#
- 1...Sf3
- 2.Qxh3#
- 2.Qxf3#
- 1...Sg6
- 2.Qxh3#
- 2.Qf3#
- 1...f4
- 2.Qxh3#
- 2.Qxf4#
- 1...Kg4!
- threat
- 1.Ka1?
- Keys
- 1.Bd2!
- 1...Kf2
- 2.Bf4#
- 1...Kg2
- 2.Bf4#
- 1...Sxd3
- 2.Qf3#
- 1...Bg1
- 2.Qxg1#
- 1...Sf3
- 2.Qxf3#
- 1...Sc4
- 2.Qf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sd7
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...f4
- 2.Be1#
- 1...Kf2
- 1.Bd2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Tries
- Try
- K(C);P-FLIGHT
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- P(b);
- Try
- K(C);S_FLIGHT
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- P(b);CHECK
- Try
- K(C);P-FLIGHT,XP(b)
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- S(g);CHECK
- Try
- K(C);S_FLIGHT
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- P(b);
- Try
- B(A);
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- P(e);XB(A)
- Try
- R(D);
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- P(b);XR(D)
- Try
- R(D);
- Vars
- K(c);S_FLIGHT::B(A)+R(D)
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD,SBLOCK::S(F)
- Refutation
- B(a);
- Try
- R(D);
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- K(c);S_FLIGHT,XR(D)
- Try
- Q(B);
- Vars
- S(g);N_GUARD,XP(E)::QAR1(B)
- S(g);N_GUARD::QAR1(B),XS(g)
- S(g);N_GUARD::QAR1(B)
- P(h);N_GUARD::S(F)
- Refutation
- B(a);
- Try
- Q(B);
- Threat
- DUALS(2)
- Refutation
- K(c);P-FLIGHT
- Try
- Actual
- B(A);
- Vars
- K(c);S_FLIGHT::R(D)+B(A)
- K(c);P-FLIGHT::R(D)+B(A)
- S(g);N_GUARD,XP(E)::QAR1(B)
- B(a);N_GUARD::QAR2(B),XB(a)
- S(g);N_GUARD::QAR1(B),XS(g)
- S(g);N_GUARD::QAR1(B)
- P(h);SBLOCK::B(A)
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