MESON Chess Problem Database
Problem Display
PID: 163353 (7B/4PKnp/1N4pb/6p1/1P1k2P1/r1p2Rp1/p1PpRqP1/N5Qn w - - 0 1)
Howard, Kenneth Samuel
The Observer, 1925
(First published on Sun May 31 1925)
#2
12 + 13
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qxg1
- 2.Rd3#
- 1...Qe3
- 2.Qxe3#
- 1...Rb3
- 2.Sxb3#
- 1...Ra4
- 2.Sb3#
- 1...Ra5
- 2.Sb3#
- 1...Ra6
- 2.Sb3#
- 1...Ra7
- 2.Sb3#
- 1...Ra8
- 2.Sb3#
- 1...d1Q
- 2.Qxd1#
- 1...d1S
- 2.Qxd1#
- 1...d1B
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Qxg1
- Tries
- 1.Kf8?
- 1...Qxg1
- 2.Rd3#
- 1...Qe3
- 2.Qxe3#
- 1...d1Q
- 2.Qxd1#
- 1...d1S
- 2.Qxd1#
- 1...d1B
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Rb3
- 2.Sxb3#
- 1...Ra4
- 2.Sb3#
- 1...Ra5
- 2.Sb3#
- 1...Ra6
- 2.Sb3#
- 1...Ra7
- 2.Sb3#
- 1...Ra8+!
- 1...Qxg1
- 1.Kg8?
- threat
- 2.Rd3#
- 1...Qe3
- 2.Qxe3#
- 1...d1Q
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Ra8+!
- threat
- 1.Rf5?
- 1...Qxg1
- 2.Rd5#
- 1...Qe3
- 2.Qxe3#
- 1...d1Q
- 2.Qxd1#
- 1...d1S
- 2.Qxd1#
- 1...d1B
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Rb3
- 2.Sxb3#
- 1...Ra4
- 2.Sb3#
- 1...Ra5
- 2.Sb3#
- 1...Ra6
- 2.Sb3#
- 1...Ra7
- 2.Sb3#
- 1...Ra8
- 2.Sb3#
- 1...gxf5!
- 1...Qxg1
- 1.Qxf2+?
- 1...gxf2
- 2.Rd3#
- 1...Sxf2!
- 1...gxf2
- 1.e8Q?
- threat
- 2.Re4#
- 2.Qd7#
- 2.Qe4#
- 2.Qe5#
- 2.Qd8#
- 1...Qe3
- 2.Qgxe3#
- 2.Qexe3#
- 1...Ra5
- 2.Sb3#
- 2.Re4#
- 2.Qe4#
- 1...Ra8
- 2.Sb3#
- 2.Re4#
- 2.Qd7#
- 2.Qe4#
- 2.Qe5#
- 1...Ra7+!
- threat
- 1.e8S?
- 1...Qxg1
- 2.Rd3#
- 1...Qe3
- 2.Qxe3#
- 1...d1Q
- 2.Qxd1#
- 1...d1S
- 2.Qxd1#
- 1...d1B
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Rb3
- 2.Sxb3#
- 1...Ra4
- 2.Sb3#
- 1...Ra5
- 2.Sb3#
- 1...Ra6
- 2.Sb3#
- 1...Ra8
- 2.Sb3#
- 1...Ra7+!
- 1...Qxg1
- 1.e8B?
- 1...Qxg1
- 2.Rd3#
- 1...Qe3
- 2.Qxe3#
- 1...d1Q
- 2.Qxd1#
- 1...d1S
- 2.Qxd1#
- 1...d1B
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Rb3
- 2.Sxb3#
- 1...Ra4
- 2.Sb3#
- 1...Ra5
- 2.Sb3#
- 1...Ra6
- 2.Sb3#
- 1...Ra8
- 2.Sb3#
- 1...Ra7+!
- 1...Qxg1
- 1.e8R?
- threat
- 2.R2e4#
- 2.R8e4#
- 2.Rd8#
- 1...Qe3
- 2.Qxe3#
- 1...Ra5
- 2.Sb3#
- 2.R2e4#
- 2.R8e4#
- 1...Ra8
- 2.Sb3#
- 2.R2e4#
- 2.R8e4#
- 1...Ra7+!
- threat
- 1.Kf8?
- Keys
- 1.Rf6!
- 1...Qxg1
- 2.Rd6#
- 1...Qe3
- 2.Qxe3#
- 1...d1Q
- 2.Qxd1#
- 1...d1S
- 2.Qxd1#
- 1...d1B
- 2.Qxd1#
- 1...d1R
- 2.Qxd1#
- 1...Rb3
- 2.Sxb3#
- 1...Ra4
- 2.Sb3#
- 1...Ra5
- 2.Sb3#
- 1...Ra6
- 2.Sb3#
- 1...Ra7
- 2.Sb3#
- 1...Ra8
- 2.Sb3#
- 1...Sf5
- 2.Rd6#
- 1...Sh5
- 2.Rf4#
- 1...Se6
- 2.Rf4#
- 1...Se8
- 2.Rf4#
- 1...Qxg1
- 1.Rf6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- Q(d);N_PINR(F),N_SPINQ(d),XQ(B)::R1(F)
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- R(e);N_GUARD::S(A),XR(e)
- R(e);N_GUARD::S(A)
- R(e);N_GUARD,P_PINP(J)::S(A)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XS(c)
- P(c);OGATEB::QAR(B),XB(c)
- P(c);OGATEB::QAR(B),XR(c)
- Tries
- Try
- K(K);P-FLIGHT
- Vars
- Q(d);N_PINR(F),N_SPINQ(d),XQ(B)::R1(F)
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XS(c)
- P(c);OGATEB::QAR(B),XB(c)
- P(c);OGATEB::QAR(B),XR(c)
- R(e);N_GUARD::S(A),XR(e)
- R(e);N_GUARD::S(A)
- Refutation
- R(e);CHECK
- Try
- K(K);N_SPINR(F),S_FLIGHT
- Threat
- R1(F)
- Vars
- Q(d);OGATE::QAB1(B),XQ(d)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XR(c)
- Refutation
- R(e);CHECK
- Try
- R(F);
- Vars
- Q(d);N_PINR(F),N_SPINQ(d),XQ(B)::R1(F)
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XS(c)
- P(c);OGATEB::QAR(B),XB(c)
- P(c);OGATEB::QAR(B),XR(c)
- R(e);N_GUARD::S(A),XR(e)
- R(e);N_GUARD::S(A)
- R(e);N_GUARD,P_PINP(J)::S(A)
- Refutation
- P(j);XR(F)
- Try
- Q(B);CHECK,N_SPINR(F),XQ(d)
- Vars
- P(g);XQ(B)::R1(F)
- Refutation
- S(a);XQ(B)
- Try
- P(J);
- Threat
- DUALS(5)
- Refutation
- R(e);CHECK
- Try
- P(J);
- Vars
- Q(d);N_PINR(F),N_SPINQ(d),XQ(B)::R1(F)
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XS(c)
- P(c);OGATEB::QAR(B),XB(c)
- P(c);OGATEB::QAR(B),XR(c)
- R(e);N_GUARD::S(A),XR(e)
- R(e);N_GUARD::S(A)
- Refutation
- R(e);CHECK
- Try
- P(J);
- Vars
- Q(d);N_PINR(F),N_SPINQ(d),XQ(B)::R1(F)
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XS(c)
- P(c);OGATEB::QAR(B),XB(c)
- P(c);OGATEB::QAR(B),XR(c)
- R(e);N_GUARD::S(A),XR(e)
- R(e);N_GUARD::S(A)
- Refutation
- R(e);CHECK
- Try
- P(J);
- Threat
- DUALS(3)
- Vars
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- Refutation
- R(e);CHECK
- Try
- Actual
- R(F);N_PINS(l)
- Vars
- Q(d);N_PINR(F),N_SPINQ(d),XQ(B)::R(F)
- Q(d);N_PINR(F),OGATE::QAB1(B),XQ(d)
- P(c);OGATEB::QAR(B),XQ(c)
- P(c);OGATEB::QAR(B),XS(c)
- P(c);OGATEB::QAR(B),XB(c)
- P(c);OGATEB::QAR(B),XR(c)
- R(e);N_GUARD::S(A),XR(e)
- R(e);N_GUARD::S(A)
- R(e);N_GUARD,P_PINP(J)::S(A)
- S(l);N_PINR(F)::B(L)+R(F),DCHECK
- S(l);::B(L)+R(F),DCHECK
Developed and maintained by Brian Stephenson.
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CSS/Javascript (jQuery, Bootstrap & DataTables).