MESON Chess Problem Database

Problem Display
PID: 108895 (8/8/p7/1P1Q4/k1K5/p7/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2006

8/8/p7/1P1Q4/k1K5/p7/8/8

#2

3 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...axb5+
      • 2.Qxb5#
    • 1...a5
      • 2.Qd1#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qxa6#
      • 1...axb5+
        • 2.Qxb5#
      • 1...Ka5
        • 2.Qxa6#
      • 1...a5!
    • 1.Qa8?
      • threat
        • 2.Qxa6#
      • 1...Ka5
        • 2.Qxa6#
      • 1...a5!
    • 1.Qd2?
      • threat
        • 2.Qb4#
      • 1...a5
        • 2.Qd1#
        • 2.Qc2#
      • 1...axb5+!
    • 1.Qd6?
      • threat
        • 2.Qb4#
        • 2.Qxa6#
      • 1...Ka5
        • 2.Qxa6#
      • 1...a5
        • 2.Qd1#
      • 1...axb5+!
    • 1.b6?
      • 1...a5
        • 2.Qc6#
        • 2.Qd1#
        • 2.Qb5#
        • 2.Qd7#
      • 1...a2!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qxa6#
      • 1...axb5+
        • 2.Qxb5#
      • 1...Ka5
        • 2.Qxa6#
      • 1...a5
        • 2.b6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);CHECK,OGATE,XP(B)::QAB1(C),XP(c)
    • P(c);SBLOCK::QAB(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR2(C),XP(c)
      • Vars
        • P(c);CHECK,OGATE,XP(B)::QAB1(C),XP(c)
        • K(b);P-FLIGHT::QAR1(C),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAR2(C),XP(c)
      • Vars
        • K(b);P-FLIGHT::QAR1(C),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Refutation
        • P(c);CHECK,XP(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR1(C),XP(c)
        • P(c);SBLOCK::QAB(C)
      • Refutation
        • P(c);CHECK,XP(B)
    • Try
      • P(B);
      • Refutation
        • P(a);
  • Actual
    • Q(C);
    • Threat
      • QAR2(C),XP(c)
    • Vars
      • P(c);CHECK,OGATE,P_SPINP(c),XP(B)::QAB1(C),XP(c)
      • K(b);P-FLIGHT::QAR1(C),XP(c)
      • P(c);SBLOCK::QAB(C)+P(B)
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