MESON Chess Problem Database

Problem Display
PID: 64729 (1b6/8/k1K5/p7/n2Q4/3P4/8/8 w - - 0 1)

Griffiths, RF

Chess, 1947

1b6/8/k1K5/p7/n2Q4/3P4/8/8

#2

3 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ba7
      • 2.Qc4#
    • 1...Sb2
      • 2.Qb6#
    • 1...Sc3
      • 2.Qb6#
    • 1...Sb6
      • 2.Qxb6#
  • Tries
    • 1.Qb2?
      • threat
        • 2.Qb7#
      • 1...Ka7
        • 2.Qb7#
      • 1...Sc5
        • 2.Qb6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sxb2!
    • 1.Qb4?
      • threat
        • 2.Qb7#
      • 1...Ka7
        • 2.Qxa5#
        • 2.Qb7#
      • 1...Sc5
        • 2.Qb6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...axb4!
  • Keys
    • 1.Qd8!
      • 1...Ka7
        • 2.Qxa5#
      • 1...Bh2
        • 2.Qa8#
      • 1...Bg3
        • 2.Qa8#
      • 1...Bf4
        • 2.Qa8#
      • 1...Be5
        • 2.Qa8#
      • 1...Bd6
        • 2.Qa8#
      • 1...Ba7
        • 2.Qc8#
      • 1...Bc7
        • 2.Qa8#
      • 1...Sb2
        • 2.Qb6#
      • 1...Sc3
        • 2.Qb6#
      • 1...Sc5
        • 2.Qb6#
      • 1...Sb6
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • B(d);SBLOCK::QAB(B)
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • S(a);N_GUARD::QAR1(B)
        • S(a);N_GUARD::QAR1(B),XS(a)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(a);N_GUARD::QAR1(B)
        • S(a);N_GUARD::QAR1(B),XS(a)
      • Refutation
        • P(b);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(c);P-FLIGHT::QAR2(B),XP(b)
      • B(d);OGATE::QAR2(B)
      • B(d);SBLOCK::QAB(B)
      • S(a);N_GUARD::QAR1(B)
      • S(a);N_GUARD::QAR1(B),XS(a)
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