MESON Chess Problem Database

Problem Display
PID: 138714 (8/pp6/1pp5/1k6/8/1K6/8/Q7 w - - 0 1)

Lincoln, Robert A

StrateGems, 2010

8/pp6/1pp5/1k6/8/1K6/8/Q7

#2

2 + 5

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qe5#
    • 1...c5
      • 2.Qa4#
  • Tries
    • 1.Qa3?
      • 1...c5
        • 2.Qa4#
      • 1...a6
        • 2.Qb4#
      • 1...a5!
    • 1.Qxa7?
      • 1...c5
        • 2.Qa4#
      • 1...Kc5!
  • Keys
    • 1.Qd4!
      • 1...Ka5
        • 2.Qa4#
      • 1...Ka6
        • 2.Qa4#
      • 1...c5
        • 2.Qa4#
      • 1...a5
        • 2.Qc4#
      • 1...a6
        • 2.Qb4#

Anticipated by 102150(1927)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR2(A)
    • P(c);SBLOCK::QAB1(A)
  • Tries
    • Try
      • Q(A);
      • Vars
        • P(c);SBLOCK::QAB1(A)
        • P(d);SBLOCK::QAR1(A)
      • Refutation
        • P(d);
    • Try
      • Q(A);XP(d)
      • Vars
        • P(c);SBLOCK::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
  • Actual
    • Q(A);
    • Vars
      • K(a);P-FLIGHT::QAR1(A)
      • K(a);S_FLIGHT::QAR2(A)
      • P(c);SBLOCK::QAB1(A)
      • P(d);SBLOCK::QAB1(A)
      • P(d);SBLOCK::QAR1(A)
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