MESON Chess Problem Database

Problem Display
PID: 142465 (8/8/8/p7/QN6/1p6/1p6/1k2K3 w - - 0 1)

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

The Problemist, 1972

8/8/8/p7/QN6/1p6/1p6/1k2K3

#2

3 + 4

14867 BCPS Library 2011
3713 Snap 2011
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qxb3?
      • threat
        • 2.Qd1#
      • 1...Ka1
        • 2.Qa2#
      • 1...Kc1
        • 2.Qd1#
        • 2.Qc2#
      • 1...axb4!
  • Keys
    • 1.Sa2!
      • 1...Ka1
        • 2.Sc3#
      • 1...Kc2
        • 2.Qe4#
      • 1...bxa2
        • 2.Qd1#

Anticipated by 9360(1901), 144059(1907), 107321(1909)

This anticipates 27356(2001), 198081(2015)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);P_PINP(b),XP(c)
      • Threat
        • QAR2(B)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(B)
      • Refutation
        • P(d);XS(C)
  • Actual
    • S(C);
    • Vars
      • K(a);P-FLIGHT::QAR(B)+S(C)
      • K(a);P_SPINP(c),S_FLIGHT::QAB(B)
      • P(c);OGATE,SBLOCK,XS(C)::QAR2(B)
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