MESON Chess Problem Database

Problem Display
PID: 234447 (8/8/8/4Qp2/7p/5p1p/8/5K1k w - - 0 1)

Lincoln, Robert A

ChessStar, 2013

8/8/8/4Qp2/7p/5p1p/8/5K1k

#2

2 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Kf2?
      • 1...h2
        • 2.Qa1#
        • 2.Qe1#
      • 1...f4!
    • 1.Qg3?
      • threat
        • 2.Qg1#
        • 2.Qxh3#
      • 1...f2
        • 2.Qxh3#
      • 1...h2
        • 2.Qxf3#
      • 1...hxg3!
    • 1.Qf4?
      • 1...h2
        • 2.Qxf3#
      • 1...f2!
    • 1.Qxf5?
      • threat
        • 2.Qxh3#
      • 1...h2
        • 2.Qxf3#
      • 1...Kh2!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qg1#
      • 1...Kh2
        • 2.Qg1#
      • 1...f2
        • 2.Qxh3#
      • 1...h2
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Refutation
        • P(e);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR2(B),XP(c)
        • P(c);SBLOCK::QAB(B),XP(b)
      • Refutation
        • P(d);XQ(B)
    • Try
      • Q(B);
      • Vars
        • P(c);SBLOCK::QAB(B),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(B);XP(e)
      • Threat
        • QAR2(B),XP(c)
      • Vars
        • P(c);SBLOCK::QAB(B),XP(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(a);P-FLIGHT::QAB1(B)
      • P(b);OGATE::QAR2(B),XP(c)
      • P(c);SBLOCK::QAB(B),XP(b)
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