MESON Chess Problem Database

Problem Display
PID: 184987 (8/8/3pQ3/8/2RNn3/KN1k3r/5P2/8 w - - 0 1)

Holroyd, GC

The Observer, 1929

(First published on Sun Sep 1 1929)

8/8/3pQ3/8/2RNn3/KN1k3r/5P2/8

#2

6 + 4

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Sc1#
      • 2.Qe2#
    • 1...Sxf2
      • 2.Qe2#
    • 1...Sc5
      • 2.Qe2#
    • 1...Sg5
      • 2.Qe2#
    • 1...Sf6
      • 2.Qe2#
  • Tries
    • 1.Rc1?
      • threat
        • 2.Qc4#
      • 1...Sxf2
        • 2.Qe2#
      • 1...Sd2
        • 2.Qe2#
      • 1...Sg3
        • 2.Qe3#
      • 1...Sc5
        • 2.Qe2#
      • 1...Sg5
        • 2.Qe2#
      • 1...Sf6
        • 2.Qe2#
      • 1...d5
        • 2.Qa6#
      • 1...Sc3!
  • Keys
    • 1.Rc2!
      • threat
        • 2.Qc4#
      • 1...Sxf2
        • 2.Qe2#
      • 1...Sd2
        • 2.Qe2#
      • 1...Sc3
        • 2.Rd2#
      • 1...Sg3
        • 2.Qe3#
      • 1...Sc5
        • 2.Qe2#
      • 1...Sg5
        • 2.Qe2#
      • 1...Sf6
        • 2.Qe2#
      • 1...d5
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE,XP(A)::QAB1(F)
    • S(c);OGATE::QAB1(F)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAB1(F)
      • Vars
        • S(c);OGATE,XP(A)::QAB1(F)
        • S(c);OGATE::QAB1(F)
        • S(c);OGATE::QAR1(F)
        • P(d);OGATE::QAB(F)
      • Refutation
        • S(c);
  • Actual
    • R(D);
    • Threat
      • QAB1(F)
    • Vars
      • S(c);OGATE,XP(A)::QAB1(F)
      • S(c);OGATE::QAB1(F)
      • S(c);N_GUARD,SBLOCK::R1(D)
      • S(c);OGATE::QAR1(F)
      • P(d);OGATE::QAB(F)
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