MESON Chess Problem Database

Problem Display
PID: 134917 (4Q3/5p2/R2npP1N/3PkBP1/1Nnbp2R/r2p4/5P1K/8 w - - 0 1)

Melnichenko, Viktor Oleksandrovich

Rudenko, Valentin Fedorovich

4th Prize, Brabec-70 JT, 2008

4Q3/5p2/R2npP1N/3PkBP1/1Nnbp2R/r2p4/5P1K/8

#2

11 + 9

56 The Problemist 2009
23 Die Schwalbe 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Rxe4#
    • 1...Sxf5
      • 2.Sxf7#
    • 1...Sb7
      • 2.Rxe4#
    • 1...Sc8
      • 2.Rxe4#
    • 1...Sxe8
      • 2.Rxe4#
    • 1...e3
      • 2.f4#
  • Tries
    • 1.Sxf7+?
      • 1...Sxf7
        • 2.Qxe6#
      • 1...Kxf5!
    • 1.Bxe4?
      • threat
        • 2.Sc6#
      • 1...Rxa6
        • 2.Sxd3#
      • 1...Sxe4
        • 2.f4#
      • 1...Sxe8
        • 2.Sxf7#
      • 1...Sb5
        • 2.Sxf7#
      • 1...Sf5
        • 2.Sxf7#
      • 1...Sb7
        • 2.Sxf7#
      • 1...Sc8
        • 2.Sxf7#
      • 1...Sa5!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Rxe4#
      • 1...exd5
        • 2.Sc6#
      • 1...exf5
        • 2.Sxf7#
      • 1...Sd2
        • 2.Qxd6#
      • 1...e3
        • 2.Re4#
        • 2.f4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(g);N_GUARD::R1(D),XP(e)
    • S(g);N_GUARD,SBLOCK,XB(F)::S(J),XP(i)
    • S(g);N_GUARD,N_SPINP(h),XQ(K)::R1(D),XP(e)
    • P(e);N_GUARD::P(A)
  • Tries
    • Try
      • S(J);CHECK,XP(i)
      • Vars
        • S(g);XS(J)::QAR1(K),XP(h)
      • Refutation
        • K(f);N_SPINP(h),P-FLIGHT,XB(F)
    • Try
      • B(F);XP(e)
      • Threat
        • S(C)
      • Vars
        • R(a);N_GUARD,XR(H)::S(C),XP(b)
        • S(g);SBLOCK,XB(F)::P(A)
        • S(g);N_GUARD,N_SPINP(h),XQ(K)::S(J),XP(i)
        • S(g);N_GUARD::S(J),XP(i)
      • Refutation
        • S(c);
  • Actual
    • Q(K);N_PINP(h),P_PINS(g)
    • Threat
      • R1(D),XP(e)
    • Vars
      • P(h);SBLOCK,XP(E)::S(C)
      • P(h);SBLOCK,XB(F)::S(J),XP(i)
      • S(c);N_GUARD::QAB1(K),XS(g)
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