MESON Chess Problem Database

Problem Display
PID: 229593 (2k5/3p1Np1/n6b/3N4/5p2/7Q/1R2n3/4K3 w - - 0 1)

Melvin, Herbert A ('Hamel' or Zaak, HA)

Southend Times, 1937

(First published on Tue Jan 5 1937)

2k5/3p1Np1/n6b/3N4/5p2/7Q/1R2n3/4K3

#2

5 + 7

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc7
      • 2.Se7#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qb7#
      • 1...Sc5
        • 2.Qb8#
      • 1...Sb4!
    • 1.Qc3+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sc7
        • 2.Se7#
        • 2.Qxc7#
      • 1...Sxc3!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qf8#
        • 2.Qxa6#
      • 1...Sb4
        • 2.Qa8#
      • 1...d6
        • 2.Qh3#
      • 1...Bg5
        • 2.Qxa6#
      • 1...Sc5
        • 2.Qxc5#
        • 2.Qa8#
      • 1...Sc7
        • 2.Se7#
      • 1...Sb8
        • 2.Qf8#
      • 1...g5
        • 2.Qxa6#
      • 1...g6
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(c);SBLOCK::S(D)
  • Tries
    • Try
      • Q(C);N_PINP(e)
      • Threat
        • QAB1(C)
      • Vars
        • S(c);N_GUARD::QAR1(C)
      • Refutation
        • S(c);
    • Try
      • Q(C);CHECK,N_PINP(e)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR(C),XS(c)
      • Refutation
        • S(a);XQ(C)
  • Actual
    • Q(C);N_PINP(e)
    • Threat
      • DUALS(2)
    • Vars
      • S(c);OGATE::QAR2(C)
      • P(e);OGATEB::QAB(C)
      • B(d);::QAB(C),XS(c)
      • S(c);SBLOCK::S(D)
      • S(c);::QAR(C)
      • P(f);::QAB(C),XS(c)
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