MESON Chess Problem Database

Problem Display
PID: 271476 (1n1Q1B2/3q4/p7/P1R1P2r/3kN3/8/3PP1BP/1K6 w - - 0 1)

Woodward, LA

The Observer, 1960

(First published on Sun May 15 1960)

1n1Q1B2/3q4/p7/P1R1P2r/3kN3/8/3PP1BP/1K6

#2

11 + 5

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Sc6
      • 2.Qxd7#
  • Tries
    • 1.Kc2?
      • threat
        • 2.e3#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Rh3!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Rd5#
      • 1...Qb5+
        • 2.Sxb5#
      • 1...Qf5+
        • 2.Sxf5#
      • 1...Qb7+
        • 2.Sb5#
      • 1...Qh7+
        • 2.Sf5#
      • 1...Kxc5
        • 2.Qb6#
      • 1...Qxd6
        • 2.Qxd6#
      • 1...Rxe5
        • 2.Rc4#
      • 1...Qc6
        • 2.Sb5#
        • 2.Sf5#
      • 1...Qe6
        • 2.Sb5#
        • 2.Sf5#
      • 1...Qf7
        • 2.Sb5#
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(d);OGATE::QAR1(J),XQ(d)
    • Q(d);OGATE::QAR2(J),XQ(d)
    • S(e);N_GUARD::QAR(J),XQ(d)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • P(C)
      • Vars
        • Q(d);OGATE::QAR1(J),XQ(d)
      • Refutation
        • R(b);
  • Actual
    • S(F);N_PINQ(d)
    • Threat
      • R1(H)
    • Vars
      • Q(d);CHECK::QAR(J)+S(F),DCHECK,XQ(d)
      • Q(d);CHECK::QAR(J)+S(F),DCHECK
      • K(a);OGATEB,S_FLIGHT,XR(H)::QAB1(J)
      • Q(d);OGATE,P_SPINQ(d),XS(F)::QAR2(J),XQ(d)
      • R(b);SBLOCK,XP(I)::R1(H)
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