MESON Chess Problem Database

Problem Display
PID: 132278 (8/8/8/Q3N3/7p/5pPk/8/7K w - - 0 1)

Lincoln, Robert A

Comm., Rybynsk 7 Dney, 2005

8/8/8/Q3N3/7p/5pPk/8/7K

#2

4 + 3

145 StrateGems 2008

SOLUTION

  • SOUND
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qh2#
      • 1...Kxg3
        • 2.Qh2#
      • 1...hxg3
        • 2.Qh6#
      • 1...f2!
    • 1.Qc3?
      • 1...Kxg3
        • 2.Qxf3#
      • 1...f2
        • 2.g4#
      • 1...hxg3!
    • 1.Qb4?
      • threat
        • 2.Qg4#
        • 2.Qxh4#
      • 1...hxg3
        • 2.Qg4#
      • 1...Kxg3!
    • 1.Qd8?
      • threat
        • 2.Qxh4#
      • 1...hxg3
        • 2.Qh8#
      • 1...Kxg3!
    • 1.Qa3?
      • 1...Kxg3
        • 2.Qxf3#
      • 1...f2
        • 2.g4#
      • 1...hxg3!
    • 1.Qa4?
      • threat
        • 2.Qg4#
        • 2.Qxh4#
      • 1...hxg3
        • 2.Qg4#
      • 1...Kxg3!
    • 1.Qd5?
      • 1...Kxg3
        • 2.Qxf3#
      • 1...f2
        • 2.Qg2#
      • 1...hxg3!
    • 1.g4?
      • 1...f2
        • 2.Qc3#
        • 2.Qa3#
      • 1...Kg3!
  • Keys
    • 1.Qa8!
      • 1...Kxg3
        • 2.Qxf3#
      • 1...hxg3
        • 2.Qh8#
      • 1...f2
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(b);P-FLIGHT,XP(B)::QAB1(C)
        • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(a),XP(B)::QAR1(C),XP(a)
        • P(a);::QAR(C)+P(B)
      • Refutation
        • P(c);XP(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XP(B)::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(a),XP(B)::QAR1(C),XP(a)
        • P(a);::QAR(C)+P(B)
      • Refutation
        • P(c);XP(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XP(B)::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(B)::QAR1(C),XP(a)
        • P(a);OGATE::QAB1(C)
      • Refutation
        • P(c);XP(B)
    • Try
      • P(B);
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(B)::QAR1(C),XP(a)
      • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
      • P(a);OGATE::QAB1(C)
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