MESON Chess Problem Database

Problem Display
PID: 80515 (3B4/2p3N1/3k4/1Q6/8/5K2/8/8 w - - 0 1)

Poulsen, Erik

Skakbladet, 1967

3B4/2p3N1/3k4/1Q6/8/5K2/8/8

#2

4 + 2

145 StrateGems 2008
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qc6+?
      • 1...Ke5
        • 2.Bf6#
        • 2.Qc5#
      • 1...Kxc6!
    • 1.Qc5+?
      • 1...Kd7
        • 2.Qxc7#
      • 1...Kxc5!
    • 1.Qf5?
      • 1...c5
        • 2.Qe6#
      • 1...c6
        • 2.Se8#
      • 1...Kc6!
  • Keys
    • 1.Qc4!
      • 1...Ke5
        • 2.Qc5#
      • 1...Kd7
        • 2.Qxc7#
      • 1...c5
        • 2.Qe6#
      • 1...c6
        • 2.Qd4#

Anticipated by 162049(1925), 17254(1926), 79260(1960)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAR1(B)
        • P(b);SBLOCK::S(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAR2(B)
      • K(a);P-FLIGHT::QAR1(B),XP(b)
      • P(b);SBLOCK::QAR1(B)
      • P(b);SBLOCK::QAR2(B)
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