MESON Chess Problem Database

Problem Display
PID: 234526 (8/3p4/3P4/P1pN4/kNQ5/8/6p1/6Kb w - - 0 1)

Speckmann, Werner

Freie Presse, 1971

8/3p4/3P4/P1pN4/kNQ5/8/6p1/6Kb

#2

6 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ka3
      • 2.Qa2#
    • 1...Kxa5
      • 2.Qa6#
    • 1...cxb4
      • 2.Qxb4#
  • Tries
    • 1.Sc3+?
      • 1...Kxa5
        • 2.Qb5#
        • 2.Qxc5#
      • 1...Ka3!
    • 1.Sc7?
      • 1...Kxa5
        • 2.Qb5#
      • 1...cxb4
        • 2.Qa2#
      • 1...Ka3!
    • 1.a6?
      • 1...Ka3
        • 2.Qa2#
      • 1...cxb4
        • 2.Qxb4#
      • 1...Ka5!
  • Keys
    • 1.Sb6+!
      • 1...Ka3
        • 2.Qc3#
      • 1...Kxa5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT::QAR1(C)
    • K(c);OGATEB,P-FLIGHT,XP(D)::QAR1(C)
    • P(d);OGATE,P_SPINP(d),XS(B)::QAR1(C),XP(d)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(E);
      • Vars
        • K(c);P-FLIGHT,XP(D)::QAR1(C)
        • P(d);P_SPINP(d),SBLOCK,XS(B)::QAR2(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(D);
      • Vars
        • K(c);P-FLIGHT::QAR1(C)
        • P(d);OGATE,P_SPINP(d),XS(B)::QAR1(C),XP(d)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • S(E);CHECK
    • Vars
      • K(c);P-FLIGHT::QAR2(C)
      • K(c);P-FLIGHT,XP(D)::QAR2(C),XP(d)
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