MESON Chess Problem Database

Problem Display
PID: 248106 (4NN2/q2r3p/8/R1nnkp1R/3p4/5PP1/Q7/6BK w - - 0 1)

Blikeng, Bjarne

3rd Prize, Oslo Schackselskap, 1942

4NN2/q2r3p/8/R1nnkp1R/3p4/5PP1/Q7/6BK

#2

9 + 8

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Qe2#
    • 1...Sd3
      • 2.Qe2#
    • 1...Sa4
      • 2.Qe2#
    • 1...Se4
      • 2.f4#
    • 1...Sa6
      • 2.Qe2#
    • 1...Se6
      • 2.Qe2#
    • 1...Sb7
      • 2.Qe2#
    • 1...Sc3
      • 2.Qe6#
    • 1...Se3
      • 2.Qe6#
    • 1...Sb4
      • 2.Qe6#
    • 1...Sb6
      • 2.Qe6#
    • 1...Sf6
      • 2.Qe6#
    • 1...Sc7
      • 2.Sxd7#
    • 1...Se7
      • 2.Qe6#
  • Tries
    • 1.Qe2+?
      • 1...Se4
        • 2.Qxe4#
        • 2.f4#
      • 1...Se3!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Bxd4#
      • 1...f4
        • 2.Rh5#
      • 1...Sb3
        • 2.Qe2#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sa4
        • 2.Qe2#
      • 1...Se4
        • 2.f4#
      • 1...Sa6
        • 2.Qe2#
      • 1...Se6
        • 2.Qe2#
      • 1...Sb7
        • 2.Qe2#
      • 1...Sc3
        • 2.Qe6#
      • 1...Se3
        • 2.Qe6#
      • 1...Sb4
        • 2.Qe6#
      • 1...Sf4
        • 2.gxf4#
      • 1...Sb6
        • 2.Qe6#
      • 1...Sf6
        • 2.Qe6#
      • 1...Sc7
        • 2.Sxd7#
      • 1...Se7
        • 2.Qe6#
      • 1...d3
        • 2.Bd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD,P_SPINS(c)::QAR(C)
    • S(b);P_SPINS(c),SBLOCK::P(D)
    • S(c);OGATE,P_SPINS(b)::QAR1(C)
    • S(c);P_SPINS(b),S_CUTQ(f)::S(I),XR(g)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • R(G);N_PINP(e)
    • Threat
      • B(A),XP(a)
    • Vars
      • P(e);OGATEB::R(G)
      • S(b);N_GUARD,P_SPINS(c)::QAR(C)
      • S(b);P_SPINS(c),SBLOCK::P(D)
      • S(c);OGATE,P_SPINS(b)::QAR1(C)
      • S(c);OGATE,P_SPINS(b)::P(E),XS(c)
      • S(c);P_SPINS(b),S_CUTQ(f)::S(I),XR(g)
      • P(a);::B(A)
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Developed and maintained by Brian Stephenson.
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