MESON Chess Problem Database

Problem Display
PID: 276562 (4N1B1/3npr1r/8/1p2PQ1p/1NkB4/2p4p/2P1bK2/1R1R2n1 w - - 0 1)

Alexander, Frederick Forrest Lawrie

Western Morning News, 1926

(First published on Sat Sep 18 1926)

4N1B1/3npr1r/8/1p2PQ1p/1NkB4/2p4p/2P1bK2/1R1R2n1

#2

10 + 11

15239 Valois Notebooks 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Bf3
      • 2.Qd3#
    • 1...Sf3
      • 2.Qe6#
    • 1...Sf6
      • 2.Qc8#
    • 1...e6
      • 2.Sd6#
  • Tries
    • 1.Bxf7+?
      • 1...e6
        • 2.Sd6#
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Rxf7!
    • 1.Qxf7+?
      • 1...e6
        • 2.Sd6#
        • 2.Qxe6#
      • 1...Rxf7+!
  • Keys
    • 1.Be3!
      • threat
        • 2.Qf4#
      • 1...Bd3
        • 2.cxd3#
      • 1...Bf3
        • 2.Qd3#
      • 1...Sf3
        • 2.Qe6#
      • 1...Sc5
        • 2.Rd4#
      • 1...Sf6
        • 2.Qc8#
      • 1...e6
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(b);N_PINQ(H)::QAB1(H)
    • S(a);N_PINQ(H)::QAB(H)
    • S(h);N_PINQ(H)::QAR(H)
    • P(i);N_GUARD,N_SPINR(j)::S(I)
  • Tries
    • Try
      • B(J);CHECK,N_SPINQ(H),XR(j)
      • Refutation
        • R(k);P_PINQ(H),XB(J)
    • Try
      • Q(H);CHECK,N_SPINQ(H),XR(j)
      • Refutation
        • R(k);CHECK,P_SPINR(k),XQ(H)
  • Actual
    • B(F);
    • Threat
      • QAR(H)
    • Vars
      • B(b);OGATE::P(C),XB(b)
      • B(b);N_PINQ(H)::QAB1(H)
      • S(a);N_PINQ(H)::QAB(H)
      • S(h);SBLOCK::R1(B)
      • S(h);N_PINQ(H)::QAR(H)
      • P(i);N_GUARD,N_SPINR(j)::S(I)
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