MESON Chess Problem Database

Problem Display
PID: 270431 (2K4b/1PNQ4/5pN1/8/4k1bR/3p2n1/3PqrP1/3n1R2 w - - 0 1)

Ingre, Bengt

The Observer, 1959

2K4b/1PNQ4/5pN1/8/4k1bR/3p2n1/3PqrP1/3n1R2

#2

9 + 9

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg2
      • 2.Rf4#
    • 1...Rf4
      • 2.Rxf4#
    • 1...Rf5
      • 2.Qa4#
    • 1...Sf5
      • 2.Qd5#
    • 1...f5
      • 2.Qd5#
  • Tries
    • 1.Rxg4+?
      • 1...Rf4
        • 2.Rfxf4#
        • 2.Rgxf4#
        • 2.Qd5#
      • 1...Qxg4!
    • 1.Qxg4+?
      • 1...Rf4
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...Qxg4+!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Qe6#
      • 1...Rf4
        • 2.Rxf4#
      • 1...Rf5
        • 2.Qd4#
      • 1...f5
        • 2.Qc6#

This is a version of 270430

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(c);OGATE,XP(C)::R1(A)
    • R(c);N_SPINB(g),OGATE::R1(A),XR(c)
    • R(c);N_PINQ(H)::QAR(H)
    • S(e);N_PINQ(H)::QAB1(H)
    • P(h);N_PINQ(H)::QAB1(H)
  • Tries
    • Try
      • R(D);CHECK,N_SPINQ(H),XB(g)
      • Refutation
        • Q(b);P_PINQ(H),XR(D)
    • Try
      • Q(H);CHECK,N_SPINQ(H),XB(g)
      • Refutation
        • Q(b);CHECK,P_SPINQ(b),XQ(H)
  • Actual
    • S(G);
    • Threat
      • QAR2(H)
    • Vars
      • R(c);N_SPINB(g),OGATE::R1(A),XR(c)
      • R(c);N_PINQ(H)::QAR1(H)
      • P(h);N_PINQ(H),SBLOCK::QAB(H)
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