MESON Chess Problem Database

Problem Display
PID: 525 (BbN5/6N1/4p2p/R1pnk1p1/Q5r1/1pP2RP1/5K2/B7 w - - 0 1)

Quack, Godfrey C

2nd Comm., The Observer, 1958

(First published on Sun Jan 5 1958)

BbN5/6N1/4p2p/R1pnk1p1/Q5r1/1pP2RP1/5K2/B7

#2

10 + 9

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc3
      • 2.Rxc5#
    • 1...Sf4
      • 2.Qd4#
  • Tries
    • 1.Qe4+?
      • 1...Kxe4
        • 2.Re3#
      • 1...Rxe4!
    • 1.Qxg4?
      • threat
        • 2.Qxe6#
      • 1...Sxc3
        • 2.Bxc3#
        • 2.Rxc5#
        • 2.Qe4#
      • 1...Sc7
        • 2.Qd4#
        • 2.Qe4#
      • 1...Sf4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qxe6#
      • 1...Ke4
        • 2.Re3#
      • 1...Sxc3
        • 2.Rxc5#
      • 1...Sf4
        • 2.Qd4#
      • 1...Sc7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(d);OGATEB,P_SPINP(c),P_SPINS(d),XP(C)::R(G),XP(c)
    • S(d);P_SPINP(c),S_CUTR(b)::QAB1(F)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINS(d),XQ(F)::R1(D)
      • Refutation
        • R(b);XQ(F)
    • Try
      • Q(F);XR(b)
      • Threat
        • QAR1(F),XP(g)
      • Refutation
        • S(d);P_SPINP(c)
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XP(g)
    • Vars
      • K(e);P-FLIGHT,P_SPINS(d)::R1(D)
      • S(d);OGATEB,P_SPINP(c),P_SPINS(d),XP(C)::R(G),XP(c)
      • S(d);OGATE,P_SPINP(c)::QAB1(F)
      • S(d);P_SPINP(c),S_CUTB(i)::QAB1(F)
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