MESON Chess Problem Database

Problem Display
PID: 62333 (8/3ppp2/4kN1Q/R3N3/6K1/8/8/8 w - - 0 1)

Albarda, Johannes

4th Comm., Schakend Nederland, 1961

8/3ppp2/4kN1Q/R3N3/6K1/8/8/8

#2

5 + 4

3310 2345 Chess Problems 1997
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Se8#
  • Tries
    • 1.Kg5?
      • 1...exf6+
        • 2.Qxf6#
      • 1...Kd6
        • 2.Se8#
      • 1...d6
        • 2.Qh3#
      • 1...d5!
    • 1.Sd3?
      • 1...Kd6
        • 2.Se8#
      • 1...d5
        • 2.Ra6#
      • 1...d6
        • 2.Sf4#
      • 1...exf6!
    • 1.Sf3?
      • 1...Kd6
        • 2.Se8#
      • 1...d5
        • 2.Ra6#
      • 1...d6
        • 2.Sd4#
        • 2.Sg5#
      • 1...exf6!
    • 1.Sc4?
      • threat
        • 2.Re5#
      • 1...d5
        • 2.Ra6#
      • 1...d6!
    • 1.Ra6+?
      • 1...Kxe5
        • 2.Qe3#
        • 2.Qf4#
      • 1...d6!
  • Keys
    • 1.Qe3!
      • 1...Kd6
        • 2.Qb6#
      • 1...Kxf6
        • 2.Qh6#
      • 1...exf6
        • 2.Sc4#
      • 1...d5
        • 2.Ra6#
      • 1...d6
        • 2.Sed7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR(E)+S(D),DCHECK
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(c);CHECK,OGATE,P_SPINP(c),XS(D)::QAR1(E),XP(c)
        • K(a);P-FLIGHT::QAR(E)+S(D),DCHECK
        • P(b);SBLOCK::QAB(E)
      • Refutation
        • P(b);
    • Try
      • S(C);
      • Vars
        • K(a);P-FLIGHT::QAR(E)+S(D),DCHECK
        • P(b);N_GUARD::R(B)
        • P(b);SBLOCK::S(C)
      • Refutation
        • P(c);P_SPINP(c),XS(D)
    • Try
      • S(C);
      • Vars
        • K(a);P-FLIGHT::QAR(E)+S(D),DCHECK
        • P(b);N_GUARD::R(B)
      • Refutation
        • P(c);P_SPINP(c),XS(D)
    • Try
      • S(C);
      • Threat
        • R1(B)
      • Vars
        • P(b);N_GUARD::R(B)
      • Refutation
        • P(b);
    • Try
      • R(B);CHECK
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(E);
    • Vars
      • K(a);P-FLIGHT::QAR2(E)
      • K(a);OGATEB,P-FLIGHT,XS(D)::QAR2(E)
      • P(c);SBLOCK,XS(D)::QAR(E)+S(C)
      • P(b);N_GUARD::R(B)
      • P(b);SBLOCK::QAR(E)+S(C)
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