MESON Chess Problem Database
Problem Display
PID: 185275 (6r1/2P3pQ/B1KN2R1/7p/1pN5/1pqk4/2bP1R2/B7 w - - 0 1)
Easter, Norris
The Observer, 1931
(First published on Sun Jan 25 1931)
#2
10 + 8
| 15239 | Valois Notebooks | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Qxd2
- 2.Rxd2#
- 2.Rg3#
- 2.Rxg7#
- 1...Qd4
- 2.Sb2#
- 2.Se5#
- 2.Rg3#
- 1...Qe5
- 2.Sxe5#
- 2.Rg3#
- 1...Qf6
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 1...Qxc4+
- 2.Bxc4#
- 1...Qxd2
- Tries
- 1.Kc5?
- threat
- 2.Rg3#
- 2.Rxg7#
- 1...Qe5+
- 2.Sxe5#
- 1...Qxc4+
- 2.Bxc4#
- 1...Qf6
- 2.Sb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 1...Re8
- 2.Rg3#
- 1...Rf8
- 2.Rg3#
- 1...Rh8
- 2.Rg3#
- 1...Qd4+!
- threat
- 1.Kd5?
- threat
- 2.Sb2#
- 2.Se5#
- 2.Rg3#
- 2.Rxg7#
- 1...Qe5+
- 2.Sxe5#
- 1...Qxc4+
- 2.Bxc4#
- 1...Qxd2
- 2.Rxd2#
- 2.Rg3#
- 2.Rxg7#
- 1...Bb1
- 2.Rg3#
- 2.Rxg7#
- 1...Bd1
- 2.Rg3#
- 2.Rxg7#
- 1...Qb2
- 2.Sxb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 2.Rxg7#
- 1...Qf6
- 2.Sb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 1...Re8
- 2.Sb2#
- 2.Se5#
- 2.Rg3#
- 1...Rf8
- 2.Sb2#
- 2.Se5#
- 2.Rg3#
- 1...Rh8
- 2.Sb2#
- 2.Se5#
- 2.Rg3#
- 1...b2
- 2.Sxb2#
- 2.Se5#
- 2.Rg3#
- 2.Rxg7#
- 1...Qd4+!
- threat
- 1.Sf7?
- threat
- 2.Rd6#
- 1...Qf6+
- 2.Scd6#
- 1...Kd4
- 2.Rd6#
- 1...Ke4
- 2.Rg4#
- 1...Qd4
- 2.Rg3#
- 1...Qxc4+!
- threat
- 1.Sc8?
- threat
- 2.Rd6#
- 1...Qf6+
- 2.S4d6#
- 1...Kd4
- 2.Rd6#
- 1...Ke4
- 2.Rg4#
- 1...Qd4
- 2.Rg3#
- 1...Qxc4+!
- threat
- 1.Se8?
- threat
- 2.Rd6#
- 1...Qf6+
- 2.Scd6#
- 1...Kd4
- 2.Rd6#
- 1...Ke4
- 2.Rg4#
- 1...Qd4
- 2.Rg3#
- 1...Qxc4+!
- threat
- 1.Bxc3?
- threat
- 2.Sb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 2.Rxg7#
- 1...Bb1
- 2.Sa3#
- 2.Se3#
- 2.Rg3#
- 2.Rxg7#
- 1...Bd1
- 2.Sa3#
- 2.Se3#
- 2.Rg3#
- 2.Rxg7#
- 1...Ra8
- 2.Sb2#
- 2.Se5#
- 2.Rg3#
- 2.Rxg7#
- 1...Rb8
- 2.Sb2#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 2.Rxg7#
- 1...Re8
- 2.Sb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 1...Rf8
- 2.Sb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 1...Rh8
- 2.Sb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 1...b2
- 2.Sxb2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Rg3#
- 2.Rxg7#
- 1...bxc3!
- threat
- 1.Rg5+?
- 1...Kd4
- 2.Rd5#
- 1...g6!
- 1...Kd4
- 1.dxc3?
- threat
- 2.Rd2#
- 2.Rg3#
- 2.Rxg7#
- 1...b2
- 2.Rg3#
- 1...Re8
- 2.Rd2#
- 2.Rg3#
- 1...Rf8
- 2.Rd2#
- 2.Rg3#
- 1...Rh8
- 2.Rd2#
- 2.Rg3#
- 1...bxc3!
- threat
- 1.Kc5?
- Keys
- 1.Sb7!
- threat
- 2.Rd6#
- 1...Qf6+
- 2.Scd6#
- 1...Qxc4+
- 2.Sc5#
- 1...Kd4
- 2.Rd6#
- 1...Ke4
- 2.Rg4#
- 1...Qd4
- 2.Rg3#
- threat
- 1.Sb7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- Q(c);CHECK,OGATE,P_SPINQ(c),XS(D)::B(E),XQ(c)
- Tries
- Try
- K(F);P-FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(c);CHECK,N_PINS(D)::B(E)+S(D),DCHECK,XQ(c)
- Q(c);CHECK,OGATE,P_SPINQ(c),XS(D)::B(E),XQ(c)
- R(h);::QAB(J)+R(H),DCHECK
- Refutation
- Q(c);CHECK,N_PINS(D)
- Try
- K(F);N_SPINS(D),S_FLIGHT
- Threat
- DUALS(4)
- Vars
- Q(c);CHECK::B(E)+S(D),DCHECK,XQ(c)
- Q(c);CHECK,OGATE,P_SPINQ(c),XS(D)::B(E),XQ(c)
- Refutation
- Q(c);CHECK
- Try
- S(G);
- Threat
- QAB(J)+R(H),DCHECK
- Vars
- Q(c);CHECK,N_PINS(D)::B(E)+S(D)
- K(d);P-FLIGHT,P_SPINQ(c)::R(H)
- K(d);S_FLIGHT::QAB(J)+R(H),DCHECK
- Q(c);N_PINS(D)::QAB(J)+R(H),DCHECK
- Refutation
- Q(c);CHECK,P_SPINQ(c),XS(D)
- Try
- S(G);
- Threat
- QAB(J)+R(H),DCHECK
- Vars
- Q(c);CHECK,N_PINS(D)::B(E)+S(D)
- K(d);P-FLIGHT,P_SPINQ(c)::R(H)
- K(d);S_FLIGHT::QAB(J)+R(H),DCHECK
- Q(c);N_PINS(D)::QAB(J)+R(H),DCHECK
- Refutation
- Q(c);CHECK,P_SPINQ(c),XS(D)
- Try
- S(G);
- Threat
- QAB(J)+R(H),DCHECK
- Vars
- Q(c);CHECK,N_PINS(D)::B(E)+S(D)
- K(d);P-FLIGHT,P_SPINQ(c)::R(H)
- K(d);S_FLIGHT::QAB(J)+R(H),DCHECK
- Q(c);N_PINS(D)::QAB(J)+R(H),DCHECK
- Refutation
- Q(c);CHECK,P_SPINQ(c),XS(D)
- Try
- B(A);N_SPINS(D),XQ(c)
- Threat
- DUALS(8)
- Refutation
- P(e);XB(A)
- Try
- R(H);CHECK
- Vars
- K(d);P-FLIGHT,P_SPINQ(c)::R1(H)
- Refutation
- P(g);P_SPINP(g)
- Try
- P(B);N_SPINS(D),XQ(c)
- Threat
- DUALS(3)
- Vars
- P(b);::QAB(J)+R(H),DCHECK
- Refutation
- P(e);XP(B)
- Try
- Actual
- S(G);
- Threat
- QAB(J)+R(H),DCHECK
- Vars
- Q(c);CHECK,N_PINS(D)::B(E)+S(D)
- Q(c);CHECK,P_SPINQ(c),XS(D)::S(G)
- K(d);P-FLIGHT,P_SPINQ(c)::R(H)
- K(d);S_FLIGHT::QAB(J)+R(H),DCHECK
- Q(c);N_PINS(D)::QAB(J)+R(H),DCHECK
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).