MESON Chess Problem Database

Problem Display
PID: 85761 (8/3Q4/1B5K/4p3/3Nk1B1/8/2P5/8 w - - 0 1)

Speckmann, Werner

Neue Zurcher Nachrichten, 1972

8/3Q4/1B5K/4p3/3Nk1B1/8/2P5/8

#2

6 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...exd4
      • 2.Qxd4#
  • Tries
    • 1.Kg5?
      • 1...exd4
        • 2.Qe6#
        • 2.Qxd4#
      • 1...Ke3!
    • 1.Qf5+?
      • 1...Ke3
        • 2.Sb3#
      • 1...Kd5!
    • 1.Qc6+?
      • 1...Kf4
        • 2.Qf3#
      • 1...Ke3!
    • 1.Qd5+?
      • 1...Ke3
        • 2.Se2#
        • 2.Se6#
      • 1...Kf4
        • 2.Qf3#
      • 1...Kxd5!
    • 1.Qb7+?
      • 1...Kf4
        • 2.Qf3#
      • 1...Ke3!
  • Keys
    • 1.Qa4!
      • 1...Ke3
        • 2.Sb3#
      • 1...Kf4
        • 2.Se2#
      • 1...Kd5
        • 2.Qc6#
      • 1...exd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE,XS(B)::QAR1(F),XP(b)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);P-FLIGHT::B(D)+S(B)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(F)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(F)
      • Refutation
        • K(a);S_FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(F)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(F);
    • Vars
      • K(a);P-FLIGHT::B(D)+S(B)
      • K(a);P-FLIGHT::QAR(F)+S(B),DCHECK
      • K(a);S_FLIGHT::QAB1(F)
      • P(b);OGATE,P_SPINP(b),XS(B)::QAR1(F),XP(b)
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