MESON Chess Problem Database

Problem Display
PID: 145345 (KN1R1B2/p4pP1/2p1Pp2/r2Pk3/qnR4n/b6Q/2b2N1P/2r5 w - - 0 1)

Karlstrom, Alfred Olaf

3rd Prize=, Problemisten, 1944

KN1R1B2/p4pP1/2p1Pp2/r2Pk3/qnR4n/b6Q/2b2N1P/2r5

#2

11 + 12

5454 Near Snap 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Bd1
      • 2.Re4#
    • 1...Bb3
      • 2.Re4#
    • 1...Be4
      • 2.Rxe4#
    • 1...Bf5
      • 2.Qg3#
    • 1...Sxd5
      • 2.Sd7#
    • 1...Sf5
      • 2.Sg4#
    • 1...cxd5
      • 2.Bd6#
    • 1...f5
      • 2.Qc3#
    • 1...fxe6
      • 2.Qxe6#
  • Tries
    • 1.Qe3+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Kf5!
  • Keys
    • 1.exf7!
      • threat
        • 2.Qe6#
      • 1...Rxd5
        • 2.Re8#
      • 1...Sxd5
        • 2.Sd7#
      • 1...cxd5
        • 2.Bd6#
      • 1...Be4
        • 2.Rxe4#
      • 1...f5
        • 2.Qc3#
      • 1...Bf5
        • 2.Qg3#
      • 1...Sf5
        • 2.Sg4#

This anticipates 40834(1951)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(b);N_GUARD::R1(D)
    • B(b);N_GUARD::R1(D),XB(b)
    • B(b);SBLOCK::QAB(C)
    • S(e);SBLOCK,XP(E)::S(I)
    • S(f);SBLOCK::S(A)
    • P(i);SBLOCK,XP(E)::B(K)
    • P(j);SBLOCK::QAB(C)
    • P(l);OGATE,XP(F)::QAR1(C),XP(l)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(C),XB(b)
      • Refutation
        • K(h);P-FLIGHT
  • Actual
    • P(F);XP(l)
    • Threat
      • QAR1(C)
    • Vars
      • R(g);SBLOCK,XP(E)::R(J)
      • S(e);SBLOCK,XP(E)::S(I)
      • P(i);SBLOCK,XP(E)::B(K)
      • B(b);N_GUARD::R1(D),XB(b)
      • P(j);SBLOCK::QAB(C)
      • B(b);SBLOCK::QAB(C)
      • S(f);SBLOCK::S(A)
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