MESON Chess Problem Database

Problem Display
PID: 86474 (8/2n5/n3p2R/3PkB1K/1bR1bN1N/3pQpp1/8/8 w - - 0 1)

Rudenko, Valentin Fedorovich

1st Prize, Sahs/Shakhmaty (Riga), 1959

8/2n5/n3p2R/3PkB1K/1bR1bN1N/3pQpp1/8/8

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Sb5
      • 2.Rxe6#
    • 1...Sxd5
      • 2.Rxe6#
    • 1...Sa8
      • 2.Rxe6#
    • 1...Se8
      • 2.Rxe6#
    • 1...exd5
      • 2.Sxd3#
    • 1...exf5
      • 2.Sxf3#
  • Tries
    • 1.Sxd3+?
      • 1...Kxd5
        • 2.Qd4#
      • 1...Kd6!
    • 1.Sxf3+?
      • 1...Kxf5
        • 2.Qxe4#
      • 1...Kd6!
    • 1.Rc6?
      • threat
        • 2.Qxe4#
      • 1...exd5
        • 2.Sxd3#
        • 2.Sfg6#
      • 1...exf5
        • 2.Sxf3#
        • 2.Shg6#
      • 1...Sc5!
    • 1.Qd4+?
      • 1...Kxf4
        • 2.Qxe4#
      • 1...Kd6!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Rxe4#
      • 1...Kxf4
        • 2.Rxe4#
      • 1...Bxd5
        • 2.Sxd3#
      • 1...Bxf5
        • 2.Sxf3#
      • 1...exd5
        • 2.Sfg6#
      • 1...exf5
        • 2.Shg6#
      • 1...Sc5
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(i);N_GUARD::R1(H),XP(h)
    • S(i);N_GUARD,XP(E)::R1(H),XP(h)
    • P(h);SBLOCK,XP(E)::S(C),XP(a)
    • P(h);SBLOCK,XB(F)::S(D),XP(b)
  • Tries
    • Try
      • S(C);CHECK,XP(a)
      • Vars
        • K(f);N_SPINB(e),P-FLIGHT,XP(E)::QAR1(A)
      • Refutation
        • K(f);N_SPINB(e),P_SPINP(h),S_FLIGHT
    • Try
      • S(D);CHECK,XP(b)
      • Vars
        • K(f);N_SPINB(e),P-FLIGHT,XB(F)::QAB1(A),XB(e)
      • Refutation
        • K(f);N_SPINB(e),P_SPINP(h),S_FLIGHT
    • Try
      • R(B);
      • Threat
        • QAR1(A),XB(e)
      • Refutation
        • S(g);
    • Try
      • Q(A);CHECK,N_PINB(e)
      • Vars
        • K(f);P_SPINB(e),S_FLIGHT,XS(C)::QAR1(A),XB(e)
      • Refutation
        • K(f);P_SPINP(h),S_FLIGHT
  • Actual
    • Q(A);N_PINB(e)
    • Threat
      • R1(B),XB(e)
    • Vars
      • K(f);P_SPINB(e),S_FLIGHT,XS(C)::R1(B),XB(e)
      • B(e);N_GUARD,SBLOCK,XP(E)::S(C),XP(a)
      • B(e);N_GUARD,SBLOCK,XB(F)::S(D),XP(b)
      • P(h);SBLOCK,XP(E)::S(C)
      • P(h);SBLOCK,XB(F)::S(D)
      • S(g);N_GUARD,S_CUTB(d)::QAB(A),XS(i)
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