MESON Chess Problem Database

Problem Display
PID: 202703 (1b6/p5Q1/b7/4n2r/1P1k3r/2N2R1p/B1P2P2/1K6 w - - 0 1)

Maclay, J Neil

The Observer, 1950

(First published on Sun Jun 4 1950)

1b6/p5Q1/b7/4n2r/1P1k3r/2N2R1p/B1P2P2/1K6

#2

8 + 8

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.Rxd3#
    • 1...Bb7
      • 2.Rd3#
    • 1...Bc8
      • 2.Rd3#
  • Tries
    • 1.Qd7+?
      • 1...Bd6
        • 2.Qxd6#
      • 1...Sxd7!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qc5#
      • 1...Sxf3
        • 2.Qe3#
      • 1...Sd3
        • 2.Se2#
      • 1...Bd6
        • 2.Qxd6#
      • 1...Sc4
        • 2.Rd3#
      • 1...Sg4
        • 2.Qe4#
      • 1...Sc6
        • 2.Qe3#
      • 1...Sg6
        • 2.Qe3#
      • 1...Sd7
        • 2.Qe3#
      • 1...Sf7
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 3
  • Sets
    • B(f);N_GUARD,P_PINP(C)::R1(F),XB(f)
    • B(f);N_GUARD::R1(F)
  • Tries
    • Try
      • Q(H);CHECK,N_PINS(d)
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::QAR2(H),XB(h)
      • Refutation
        • S(d);XQ(H)
  • Actual
    • Q(H);N_PINS(d)
    • Threat
      • QAB1(H)
    • Vars
      • S(d);OGATE,XR(F)::QAB1(H)
      • S(d);S_CUTB(f)::S(E)
      • B(h);N_GUARD::QAR2(H),XB(h)
      • S(d);N_GUARD,S_CUTB(f)::R1(F)
      • S(d);OGATE::QAR1(H)
      • S(d);OGATE::QAB1(H)
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