MESON Chess Problem Database
Problem Display
PID: 336 (8/3B3K/3n1P2/8/6R1/Q2N1k2/2qP4/2N1B2b w - - 0 1)
Richardson, Gordon
The Observer, 1925
(First published on Sun May 24 1925)
#2
9 + 4
| 887 | Mate in Two Moves | 1931 |
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qd1
- 2.Se5#
- 1...Qb3
- 2.Se5#
- 1...Qxd3+
- 2.Qxd3#
- 1...Qa4
- 2.Se5#
- 1...Qxc1
- 2.Sxc1#
- 1...Qa2
- 2.Se5#
- 1...Qb2
- 2.Sxb2#
- 2.Se5#
- 1...Qxd2
- 2.Se5#
- 1...Qc3
- 2.Se5#
- 1...Qc4
- 2.Se5#
- 1...Qc5
- 2.Sxc5#
- 2.Se5#
- 1...Qc6
- 2.Sc5#
- 2.Se5#
- 1...Qc7
- 2.Sc5#
- 2.Se5#
- 1...Qc8
- 2.Sc5#
- 2.Se5#
- 1...Bg2
- 2.Rf4#
- 1...Sc4
- 2.Qa8#
- 1...Se4
- 2.Se5#
- 1...Sf5
- 2.Se5#
- 1...Qd1
- Tries
- 1.Bf5?
- threat
- 2.Se5#
- 2.Rg3#
- 1...Qxd3
- 2.Qxd3#
- 1...Qxc1
- 2.Sxc1#
- 1...Sxf5
- 2.Se5#
- 1...Se4
- 2.Se5#
- 1...Qc7+!
- threat
- 1.Bc6+?
- 1...Qxc6
- 2.Se5#
- 1...Se4
- 2.Se5#
- 2.Rg3#
- 1...Kxg4!
- 1...Qxc6
- 1.Qxd6?
- threat
- 2.Qg3#
- 2.Qf4#
- 2.Qd5#
- 1...Qxd3+
- 2.Qxd3#
- 1...Qxd2
- 2.Qg3#
- 1...Qb3
- 2.Se5#
- 2.Qg3#
- 2.Qf4#
- 1...Qa4
- 2.Se5#
- 2.Qg3#
- 1...Qa2
- 2.Se5#
- 2.Qg3#
- 2.Qf4#
- 1...Qc4
- 2.Se5#
- 2.Qg3#
- 1...Qc5
- 2.Qg3#
- 2.Qf4#
- 1...Qc6
- 2.Se5#
- 2.Qg3#
- 2.Qf4#
- 2.Qxc6#
- 1...Qc7
- 2.Se5#
- 2.Qd5#
- 1...Qxc1!
- threat
- 1.Qa8+?
- 1...Qc6
- 2.Se5#
- 1...Se4
- 2.Se5#
- 2.Rg3#
- 2.Qxe4#
- 1...Sb7!
- 1...Qc6
- 1.Bf5?
- Keys
- 1.Qb3!
- 1...Qxd3+
- 2.Qxd3#
- 1...Qxb3
- 2.Se5#
- 1...Qxc1
- 2.Sxc1#
- 1...Qxd2
- 2.Se5#
- 1...Sf5
- 2.Se5#
- 1...Qb1
- 2.Qd1#
- 1...Qd1
- 2.Se5#
- 2.Qxd1#
- 1...Qa2
- 2.Se5#
- 2.Qd1#
- 1...Qb2
- 2.Sxb2#
- 2.Se5#
- 2.Qd1#
- 1...Qc3
- 2.Se5#
- 2.Qd1#
- 1...Qc4
- 2.Se5#
- 2.Qd1#
- 1...Qc5
- 2.Sxc5#
- 2.Se5#
- 2.Qd1#
- 1...Qc6
- 2.Sc5#
- 2.Se5#
- 2.Qd1#
- 1...Qc7
- 2.Sc5#
- 2.Se5#
- 2.Qd1#
- 1...Qc8
- 2.Sc5#
- 2.Se5#
- 2.Qd1#
- 1...Bg2
- 2.Rf4#
- 1...Sc4
- 2.Qb7#
- 1...Se4
- 2.Se5#
- 1...Sb5
- 2.Qd5#
- 1...Sb7
- 2.Qd5#
- 1...Sf7
- 2.Qd5#
- 1...Sc8
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Qxd3+
- 1.Qb3!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 1
- ADDED MATES = 6
- REMOVED MATES = 5
- Sets
- Q(b);N_PINS(E)::QAR(D)+S(E),DCHECK
- Q(b);N_PINS(E)::S(E)
- Q(b);CHECK,OGATE,P_SPINQ(b),XS(E)::QAR2(D),XQ(b)
- Q(b);N_PINS(E),XS(A)::QAR(D)+S(E),XQ(b)
- Q(b);N_PINS(E),XP(C)::QAR(D)+S(E),DCHECK
- B(a);SBLOCK::R1(F)
- S(d);N_GUARD,S_CUTQ(b)::QAB(D)
- S(d);N_PINS(E)::QAR(D)+S(E),DCHECK
- Tries
- Try
- B(H);N_SPINS(E)
- Threat
- DUALS(2)
- Vars
- Q(b);OGATE,P_PINB(H),P_SPINQ(b),XS(E)::QAR2(D),XQ(b)
- Q(b);XS(A)::QAR(D)+S(E),XQ(b)
- S(d);XB(H)::QAR(D)+S(E),DCHECK
- S(d);::QAR(D)+S(E),DCHECK
- Refutation
- Q(b);CHECK
- Try
- B(H);CHECK
- Vars
- Q(b);N_PINS(E),XB(H)::QAR(D)+S(E),DCHECK
- Refutation
- K(c);S_FLIGHT,XR(F)
- Try
- Q(D);XS(d)
- Threat
- DUALS(3)
- Vars
- Q(b);CHECK,OGATE,XS(E)::QAR2(D),XQ(b)
- Q(b);N_PINS(E),XP(C)::QAR1(D)
- Refutation
- Q(b);N_PINS(E),XS(A)
- Try
- Q(D);CHECK
- Vars
- Q(b);N_PINS(E),P_SPINQ(b)::S(E)
- Refutation
- S(d);P_SPINS(d)
- Try
- Actual
- Q(D);
- Vars
- Q(b);CHECK,OGATE,P_SPINQ(b),XS(E)::QAR2(D),XQ(b)
- Q(b);N_PINS(E),XQ(D)::S(E)
- Q(b);N_PINS(E),XS(A)::QAR(D)+S(E),XQ(b)
- Q(b);N_PINS(E),XP(C)::QAR(D)+S(E),DCHECK
- S(d);N_PINS(E)::QAR(D)+S(E),DCHECK
- Q(b);OGATE::QAB(D)
- B(a);SBLOCK::R1(F)
- S(d);N_GUARD,S_CUTQ(b)::QAB(D)
- S(d);N_GUARD::QAB(D)
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).