MESON Chess Problem Database

Problem Display
PID: 253648 (B7/2ppp3/1bRP4/1PPkP3/1Rp2P2/7Q/2PNp1P1/qNB1K3 w - - 0 1)

Billington, Thomas Henry

English Mechanic and World of Science, 1888

(First published on Fri Aug 10 1888)

B7/2ppp3/1bRP4/1PPkP3/1Rp2P2/7Q/2PNp1P1/qNB1K3

#2

15 + 8

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qd3#
    • 1...Qd4
      • 2.Rxc7#
  • Tries
    • 1.Sc3+?
      • 1...Kd4
        • 2.Sb3#
        • 2.Rxc4#
        • 2.Qd3#
      • 1...Qxc3!
    • 1.Rxc7+?
      • 1...Kd4
        • 2.Sb3#
        • 2.Sf3#
        • 2.Rxc4#
        • 2.Qd3#
      • 1...Qxa8!
    • 1.Qf3+?
      • 1...Kd4
        • 2.Sb3#
        • 2.Rxc4#
        • 2.Qe4#
        • 2.Qd3#
      • 1...Ke6!
  • Keys
    • 1.Sb3!
      • 1...Qc3+
        • 2.Sxc3#
      • 1...Ke4
        • 2.Qd3#
      • 1...Qxe5
        • 2.Rxc7#
      • 1...Qxb1
        • 2.Rxc7#
      • 1...Qxa8
        • 2.Sc3#
      • 1...Bxc5
        • 2.Rxc5#
      • 1...cxb3
        • 2.Qxb3#
      • 1...cxd6
        • 2.Rxd6#
      • 1...dxc6
        • 2.Bxc6#
      • 1...exd6
        • 2.Rxd6#
      • 1...Qb2
        • 2.Rxc7#
      • 1...Qd4
        • 2.Rxc7#
      • 1...Qa2
        • 2.Sc3#
      • 1...Qa3
        • 2.Sc3#
      • 1...Qa4
        • 2.Sc3#
      • 1...Qa5
        • 2.Sc3#
      • 1...Qa6
        • 2.Sc3#
      • 1...Qa7
        • 2.Sc3#
      • 1...Ba5
        • 2.Rxc7#
      • 1...Ba7
        • 2.Rxc7#
      • 1...c3
        • 2.Rd4#
      • 1...e6
        • 2.Qf3#

Illegal Position.

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 21
    • REMOVED MATES = 1
  • Sets
    • K(d);N_GUARD,P-FLIGHT,P_SPINP(c),S_CUTQ(a)::QAR1(G)
    • Q(a);N_GUARD,SBLOCK::B(O)+R(M),XP(f)
  • Tries
    • Try
      • S(A);CHECK,P_SPINB(B)
      • Refutation
        • Q(a);N_PINB(B),P_PINS(E),XS(A)
    • Try
      • R(M);CHECK,XP(f)
      • Refutation
        • Q(a);XB(O)
    • Try
      • Q(G);CHECK
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(E);
    • Vars
      • Q(a);CHECK,N_GUARD::S(A),XQ(a)
      • K(d);N_GUARD,P_SPINP(c),S_CUTQ(a),S_FLIGHT::QAB1(G)
      • Q(a);N_GUARD,XP(L)::B(O)+R(M),XP(f)
      • Q(a);N_GUARD,P_PINB(B),XS(A)::B(O)+R(M),XP(f)
      • Q(a);N_GUARD,XB(O)::S(A)
      • B(e);OGATE,XP(K)::B(O)+R(M),DCHECK,XB(e)
      • P(c);OGATE,XS(E)::QAB(G),XP(c)
      • P(f);OGATE,XP(N)::B(O)+R(M),DCHECK,XP(f)
      • P(g);OGATE,P_SPINP(g),XR(M)::B(O),XP(g)
      • P(h);OGATE,XP(N)::B(O)+R(M),DCHECK,XP(h)
      • Q(a);N_GUARD::B(O)+R(M),XP(f)
      • Q(a);N_GUARD::S(A)
      • Q(a);N_GUARD,P_PINR(H)::S(A)
      • B(e);P_PINR(H),S_CUTQ(a)::B(O)+R(M),XP(f)
      • B(e);S_CUTQ(a)::B(O)+R(M),XP(f)
      • P(c);OGATE::R1(H)
      • P(h);SBLOCK::QAB(G)
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