MESON Chess Problem Database

Problem Display
PID: 187077 (K7/1Qp4R/n2pk2N/6PP/4qPp1/1p2R1P1/5n2/1B5b w - - 0 1)

Alexander, Frederick Forrest Lawrie

The Observer, 1934

(First published on Sun Jul 8 1934)

K7/1Qp4R/n2pk2N/6PP/4qPp1/1p2R1P1/5n2/1B5b

#2

10 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3
      • 2.Bf5#
    • 1...Qe5
      • 2.Bf5#
      • 2.f5#
    • 1...d5
      • 2.Qc6#
    • 1...c5
      • 2.Re7#
    • 1...c6
      • 2.Qf7#
  • Tries
    • 1.Rxc7?
      • threat
        • 2.Re7#
      • 1...d5
        • 2.Rc6#
        • 2.Qxa6#
        • 2.Qc6#
        • 2.Qb6#
      • 1...Sxc7+!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sd4#
      • 1...Kxf5
        • 2.Qd5#
      • 1...Qxe3
        • 2.Re7#
      • 1...c6
        • 2.Qf7#
      • 1...d5
        • 2.Qc8#
      • 1...c5
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(d);N_SPINQ(d),OGATE,XR(B)::B(A)
    • P(g);N_PINQ(H)::QAR2(H)
    • P(i);::R1(I)
    • P(i);N_PINQ(H)::QAB1(H)
  • Tries
    • Try
      • R(I);XP(i)
      • Threat
        • R1(I)
      • Refutation
        • S(f);CHECK,XR(I)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(h);S_FLIGHT,XS(G)::QAR2(H)
      • Q(d);N_SPINQ(d),XR(B)::R1(I)
      • P(i);N_PINQ(H)::QAB1(H)
      • P(g);N_PINQ(H),SBLOCK::QAB(H)
      • P(i);::S(G)
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