MESON Chess Problem Database

Problem Display
PID: 203405 (8/8/5K2/8/5pPk/5P1B/5PQn/6N1 w - - 0 1)

Oosterholt, Cornelis Johannes

Algemeen Handelsblad, 1924

8/8/5K2/8/5pPk/5P1B/5PQn/6N1

#2

7 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf3
      • 2.Sxf3#
    • 1...Sxg4+
      • 2.Qxg4#
  • Tries
    • 1.Kf5?
      • 1...Sxf3
        • 2.Sxf3#
      • 1...Sxg4
        • 2.Qxg4#
      • 1...Sf1!
    • 1.Kg6?
      • 1...Sxf3
        • 2.Sxf3#
      • 1...Sxg4
        • 2.Qxg4#
      • 1...Sf1!
    • 1.g5?
      • 1...Sg4+
        • 2.Qxg4#
      • 1...Sxf3
        • 2.Qg4#
      • 1...Sf1
        • 2.Qg4#
      • 1...Kh5!
  • Keys
    • 1.Qh1!
      • 1...Sxg4+
        • 2.Bxg4#
      • 1...Sxf3
        • 2.Sxf3#
      • 1...Sf1
        • 2.Bxf1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);XP(D)::S(A),XS(a)
    • S(a);CHECK,OGATE,XP(F)::QAR1(C),XS(a)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Vars
        • S(a);XP(D)::S(A),XS(a)
        • S(a);OGATE,XP(F)::QAR1(C),XS(a)
      • Refutation
        • S(a);
    • Try
      • K(G);P-FLIGHT
      • Vars
        • S(a);XP(D)::S(A),XS(a)
        • S(a);OGATE,XP(F)::QAR1(C),XS(a)
      • Refutation
        • S(a);
    • Try
      • P(F);
      • Vars
        • S(a);CHECK,N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD,XP(D)::QAR1(C)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • S(a);CHECK,OGATE,XP(F)::QAR(C)+B(E),XS(a)
      • S(a);XP(D)::S(A),XS(a)
      • S(a);OGATEB::QAR(C)+B(E),XS(a)
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