MESON Chess Problem Database

Problem Display
PID: 234584 (8/4N3/4p3/4p1pk/4Q3/5pB1/5K2/8 w - - 0 1)

Speckmann, Werner

Stern, 1970

8/4N3/4p3/4p1pk/4Q3/5pB1/5K2/8

#2

4 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kh6
      • 2.Qg6#
    • 1...g4
      • 2.Qg6#
  • Tries
    • 1.Ke1?
      • 1...Kh6
        • 2.Qg6#
      • 1...g4
        • 2.Qg6#
      • 1...f2+!
    • 1.Kf1?
      • 1...Kh6
        • 2.Qg6#
      • 1...g4
        • 2.Qg6#
      • 1...f2!
    • 1.Kg1?
      • 1...Kh6
        • 2.Qg6#
      • 1...g4
        • 2.Qg6#
      • 1...f2+!
    • 1.Ke3?
      • 1...Kh6
        • 2.Qg6#
      • 1...g4
        • 2.Qg6#
      • 1...f2!
    • 1.Kxf3?
      • threat
        • 2.Qg6#
        • 2.Qh7#
      • 1...Kh6
        • 2.Qg6#
      • 1...g4+!
    • 1.Bh2?
      • 1...Kh6
        • 2.Qg6#
      • 1...g4!
    • 1.Bxe5?
      • 1...Kh6
        • 2.Qg6#
      • 1...g4!
    • 1.Qf5?
      • threat
        • 2.Qh3#
      • 1...Kh6
        • 2.Qg6#
      • 1...exf5!
    • 1.Qxe5?
      • 1...Kh6
        • 2.Qh8#
      • 1...Kg4!
  • Keys
    • 1.Bh4!
      • 1...Kh6
        • 2.Qg6#
      • 1...gxh4
        • 2.Qg6#
      • 1...g4
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(d);P-FLIGHT::QAR1(C)
    • P(c);::QAB1(C)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
        • P(c);::QAB1(C)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
        • P(c);::QAB1(C)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
        • P(c);::QAB1(C)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
        • P(c);::QAB1(C)
      • Refutation
        • P(a);
    • Try
      • K(A);P-FLIGHT,XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
      • Refutation
        • P(c);CHECK
    • Try
      • B(B);
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
      • Refutation
        • P(c);
    • Try
      • B(B);XP(b)
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAR2(C)
      • Vars
        • K(d);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • P(e);N_SPINP(c),XQ(C)
    • Try
      • Q(C);P_PINP(c),XP(b)
      • Vars
        • K(d);N_SPINP(c),P-FLIGHT::QAR2(C)
      • Refutation
        • K(d);N_SPINP(c),S_FLIGHT
  • Actual
    • B(B);
    • Vars
      • K(d);P-FLIGHT::QAR1(C)
      • P(c);SBLOCK,XB(B)::QAB1(C)
      • P(c);SBLOCK::QAR2(C)
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