MESON Chess Problem Database

Problem Display
PID: 249024 (8/7K/8/1R6/2p5/2p5/knn1B1R1/bNQ5 w - - 0 1)

Blikeng, Bjarne

Prize, Dagbladet, 1971

8/7K/8/1R6/2p5/2p5/knn1B1R1/bNQ5

#2

6 + 6

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Bxc4#
    • 1...Sa4
      • 2.Bxc4#
    • 1...Se1
      • 2.Bxc4#
    • 1...Sa3
      • 2.Sxc3#
    • 1...Sb4
      • 2.Bxc4#
  • Tries
    • 1.Rxb2+?
      • 1...cxb2
        • 2.Bxc4#
      • 1...Bxb2!
    • 1.Ra5+?
      • 1...Sa4
        • 2.Bxc4#
      • 1...Sa3
        • 2.Bxc4#
        • 2.Rxa3#
      • 1...Kb3!
  • Keys
    • 1.Bd1!
      • 1...Sxd1
        • 2.Qa3#
      • 1...Sd3
        • 2.Qa3#
      • 1...Sa4
        • 2.Qa3#
      • 1...Se1
        • 2.Ra5#
      • 1...Sa3
        • 2.Sxc3#
      • 1...Se3
        • 2.Ra5#
      • 1...Sb4
        • 2.Ra5#
      • 1...Sd4
        • 2.Ra5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::B(C),XP(f)
    • S(d);S_CUTS(c)::B(C),XP(f)
    • S(d);SBLOCK::S(A),XP(e)
  • Tries
    • Try
      • R(E);CHECK,XS(c)
      • Vars
        • P(e);XR(E)::B(C),XP(f)
      • Refutation
        • B(a);XR(E)
    • Try
      • R(E);CHECK
      • Vars
        • S(c);P_SPINS(c)::B(C),XP(f)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • B(C);
    • Vars
      • S(c);OGATE,P_SPINS(d),XB(C)::QAR1(B)
      • S(c);OGATE,P_SPINS(d)::QAR1(B)
      • S(d);N_GUARD,P_SPINS(c)::R(E)
      • S(d);P_SPINS(c),SBLOCK::S(A),XP(e)
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