MESON Chess Problem Database
Problem Display
PID: 186800 (5n2/5P2/1Pp2Qn1/2qk1PPp/2NN3R/4K3/B7/2R5 w - - 0 1)
Stuart Green, G
The Observer, 1933
(First published on Sun Mar 26 1933)
#2
11 + 6
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qa3+
- 2.Sxa3#
- 1...Qb4
- 2.Qxc6#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qxb6
- 2.Sxb6#
- 2.Qd6#
- 1...Qd6
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sxd6#
- 2.Qxd6#
- 1...Qe7+
- 2.Se5#
- 1...Qa5
- 2.Sa3#
- 2.Sxa5#
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Sf4
- 2.Qe5#
- 1...Sxh4
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Se7
- 2.Qe5#
- 1...Sh8
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...Qa3+
- Tries
- 1.Kf2?
- threat
- 2.Se3#
- 1...Sxh4
- 2.Qe5#
- 1...Sf4
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Qxc4!
- threat
- 1.Bb3?
- 1...Qxd4+
- 2.Qxd4#
- 1...Qe7+
- 2.Se5#
- 1...Qxb6
- 2.Sxb6#
- 2.Qd6#
- 1...Sxh4
- 2.Qe5#
- 1...Qa3
- 2.Sxa3#
- 2.Qxc6#
- 1...Qb4
- 2.Qxc6#
- 1...Qd6
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sxd6#
- 2.Qxd6#
- 1...Qa5
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sxa5#
- 2.Se5#
- 2.Sd6#
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Sf4
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Se7
- 2.Qe5#
- 1...Sh8
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...Qxc4!
- 1...Qxd4+
- 1.Rc2?
- 1...Qa3+
- 2.Sxa3#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qe7+
- 2.Se5#
- 1...Qxb6
- 2.Sxb6#
- 2.Qd6#
- 1...Sxh4
- 2.Qe5#
- 1...Qb4
- 2.Qxc6#
- 1...Qd6
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sxd6#
- 2.Qxd6#
- 1...Qa5
- 2.Sa3#
- 2.Sxa5#
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Sf4
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Se7
- 2.Qe5#
- 1...Sh8
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...Qxc4!
- 1...Qa3+
- 1.Rc3?
- 1...Qxd4+
- 2.Qxd4#
- 1...Qe7+
- 2.Se5#
- 1...Qxb6
- 2.Sxb6#
- 2.Qd6#
- 1...Sxh4
- 2.Qe5#
- 1...Qa3
- 2.Sxa3#
- 2.Qxc6#
- 1...Qb4
- 2.Qxc6#
- 1...Qd6
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sxd6#
- 2.Qxd6#
- 1...Qa5
- 2.Sa3#
- 2.Sxa5#
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Sf4
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Se7
- 2.Qe5#
- 1...Sh8
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...Qxc4!
- 1...Qxd4+
- 1.Re4?
- 1...Qa3+
- 2.Sxa3#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qxb6
- 2.Sxb6#
- 2.Qd6#
- 1...Qxc4
- 2.Qxc6#
- 1...Qb4
- 2.Qxc6#
- 1...Qd6
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sxd6#
- 2.Qxd6#
- 1...Qe7
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sd6#
- 2.Qxc6#
- 1...Qa5
- 2.Sa3#
- 2.Sxa5#
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Sf4
- 2.Re5#
- 2.Qe5#
- 1...Sh4
- 2.Re5#
- 2.Qe5#
- 1...Se5
- 2.Rxe5#
- 2.Qxe5#
- 1...Se7
- 2.Re5#
- 2.Qe5#
- 1...Sh8
- 2.Re5#
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...h4!
- 1...Qa3+
- 1.Rxh5?
- 1...Qa3+
- 2.Sxa3#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qe7+
- 2.Se5#
- 1...Qxb6
- 2.Sxb6#
- 2.Qd6#
- 1...Qb4
- 2.Qxc6#
- 1...Qd6
- 2.Sb2#
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sxd6#
- 2.Qxd6#
- 1...Qa5
- 2.Sa3#
- 2.Sxa5#
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Sf4
- 2.Qe5#
- 1...Sh4
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Se7
- 2.Qe5#
- 1...Sh8
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...Qxc4!
- 1...Qa3+
- 1.Qd8+?
- 1...Qd6
- 2.Qxd6#
- 1...Sd7!
- 1...Qd6
- 1.b7?
- threat
- 2.Sb6#
- 1...Qa3+
- 2.Sxa3#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qe7+
- 2.Se5#
- 1...Qb6
- 2.Sxb6#
- 2.Qd6#
- 1...Se6
- 2.Qxe6#
- 1...Qxc4!
- threat
- 1.Kf2?
- Keys
- 1.Rd1!
- 1...Qa3+
- 2.Sb3#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qe7+
- 2.Se6#
- 1...Qxb6
- 2.Qd6#
- 1...Qxc4
- 2.Se6#
- 1...Sxh4
- 2.Qe5#
- 1...Qb4
- 2.Qxc6#
- 1...Qd6
- 2.Sb3#
- 2.Se6#
- 2.Qxd6#
- 1...Qa5
- 2.Qxc6#
- 2.Qd6#
- 1...Qb5
- 2.Sb3#
- 2.Se6#
- 2.Qd6#
- 1...Sf4
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Se7
- 2.Qe5#
- 1...Sh8
- 2.Qe5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...Qa3+
- 1.Rd1!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D),XQ(a)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D)
- Q(a);N_GUARD,N_PINS(E)::QAR1(J)
- S(e);N_GUARD::QAR1(J)
- S(e);N_GUARD,XR(F)::QAR1(J)
- S(e);N_GUARD::QAR1(J),XS(e)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
- Tries
- Try
- K(C);S_FLIGHT
- Threat
- B(B)+S(D),DCHECK
- Vars
- S(e);N_GUARD,XR(F)::QAR1(J)
- S(e);N_GUARD::QAR1(J)
- S(f);N_GUARD::QAB1(J),XS(f)
- Refutation
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)
- Try
- B(B);
- Vars
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D)
- S(e);N_GUARD,XR(F)::QAR1(J)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- Q(a);N_GUARD,N_PINS(E)::QAR1(J)
- S(e);N_GUARD::QAR1(J)
- S(e);N_GUARD::QAR1(J),XS(e)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
- Refutation
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)
- Try
- R(A);
- Vars
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D),XQ(a)
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D)
- S(e);N_GUARD,XR(F)::QAR1(J)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- Q(a);N_GUARD,N_PINS(E)::QAR1(J)
- S(e);N_GUARD::QAR1(J)
- S(e);N_GUARD::QAR1(J),XS(e)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
- Refutation
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)
- Try
- R(A);
- Vars
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D)
- S(e);N_GUARD,XR(F)::QAR1(J)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- Q(a);N_GUARD,N_PINS(E)::QAR1(J)
- S(e);N_GUARD::QAR1(J)
- S(e);N_GUARD::QAR1(J),XS(e)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
- Refutation
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)
- Try
- R(F);
- Vars
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D),XQ(a)
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);N_GUARD,N_PINS(E),P_SPINQ(a),XS(D)::QAB1(J),XP(d)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- Q(a);N_GUARD,N_PINS(E)::QAR1(J)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
- Refutation
- P(c);
- Try
- R(F);XP(c)
- Vars
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D),XQ(a)
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- Q(a);N_GUARD,N_PINS(E)::QAR1(J)
- S(e);N_GUARD::QAR1(J)
- S(e);N_GUARD::QAR1(J),XS(e)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
- Refutation
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)
- Try
- Q(J);CHECK
- Vars
- Q(a);N_GUARD,N_PINS(E),P_SPINQ(a)::QAR1(J),XQ(a)
- Refutation
- S(f);P_SPINS(f)
- Try
- P(I);
- Threat
- B(B)+S(D),DCHECK
- Vars
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D),XQ(a)
- Q(a);CHECK,OGATE,XS(E)::QAR1(J),XQ(a)
- Q(a);CHECK,N_GUARD,N_PINS(E)::B(B)+S(D)
- S(f);N_GUARD::QAB1(J),XS(f)
- Refutation
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)
- Try
- Actual
- R(A);
- Vars
- Q(a);CHECK,N_PINS(E)::R(A)+S(E)
- Q(a);CHECK,OGATE,P_SPINQ(a),XS(E)::QAR1(J),XQ(a)
- Q(a);N_GUARD,XP(I)::QAR1(J)
- Q(a);N_PINS(E),P_SPINQ(a),XS(D)::R(A)+S(E)
- S(e);N_GUARD,XR(F)::QAR1(J)
- Q(a);N_GUARD,N_PINS(E)::QAB1(J),XP(d)
- S(e);N_GUARD::QAR1(J)
- S(e);N_GUARD::QAR1(J),XS(e)
- S(f);N_GUARD::QAB1(J),XS(f)
- S(f);N_GUARD::QAB1(J)
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