MESON Chess Problem Database

Problem Display
PID: 195839 (b7/8/n2p1K2/1R1B1Q2/3kP3/4p3/1PP5/4n3 w - - 0 1)

Holroyd, GC

The Observer, 1942

(First published on Sun May 10 1942)

b7/8/n2p1K2/1R1B1Q2/3kP3/4p3/1PP5/4n3

#2

7 + 6

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Qxd5#
    • 1...Sd3
      • 2.c3#
    • 1...Sc5
      • 2.Rb4#
    • 1...e2
      • 2.Qf2#
  • Tries
    • 1.Bxa8?
      • threat
        • 2.Qd5#
      • 1...Kc4
        • 2.Qd5#
      • 1...Sb4
        • 2.Rxb4#
      • 1...Sc7
        • 2.Rb4#
      • 1...d5
        • 2.Qxd5#
      • 1...e2!
    • 1.Qf1?
      • threat
        • 2.Qc4#
        • 2.c3#
      • 1...Sxc2
        • 2.Qc4#
        • 2.Qd1#
      • 1...e2
        • 2.Qg1#
        • 2.Qf2#
      • 1...Sd3
        • 2.Qxd3#
        • 2.c3#
      • 1...Bxd5!
  • Keys
    • 1.Qg4!
      • threat
        • 2.e5#
      • 1...Bxd5
        • 2.exd5#
      • 1...Sxc2
        • 2.Qd1#
      • 1...e2
        • 2.Qg1#
      • 1...Sg2
        • 2.Qd1#
      • 1...Sd3
        • 2.c3#
      • 1...Sc5
        • 2.Rb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(f);OGATE,XB(E)::QAR1(F),XB(f)
    • S(a);SBLOCK::P(B)
    • S(d);N_GUARD,SBLOCK::R(D)
    • P(b);OGATEB::QAB(F)
  • Tries
    • Try
      • B(E);XB(f)
      • Threat
        • QAR1(F)
      • Vars
        • K(c);P-FLIGHT::QAB1(F)
        • S(d);N_GUARD::R(D),XS(d)
        • S(d);N_GUARD::R(D)
        • P(e);::QAR1(F),XP(e)
      • Refutation
        • P(b);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Refutation
        • B(f);XB(E)
  • Actual
    • Q(F);
    • Threat
      • QAR(F)+P(C)
    • Vars
      • B(f);OGATE,XB(E)::QAR(F)+P(C),XB(f)
      • S(a);N_GUARD,XP(B)::QAR(F)
      • P(b);OGATEB::QAB(F)
      • S(a);N_GUARD::QAR(F)
      • S(a);SBLOCK::P(B)
      • S(d);N_GUARD,SBLOCK::R(D)
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