MESON Chess Problem Database

Problem Display
PID: 177933 (4K3/8/1N2N1n1/8/3pkPP1/R6R/8/8 w - - 0 1)

Udartsev, Valentin Filipovich

2nd Comm., Sahs (Latvia), 1988

4K3/8/1N2N1n1/8/3pkPP1/R6R/8/8

#2

7 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Ra4#
  • Tries
    • 1.Ra2?
      • threat
        • 2.Re2#
      • 1...d3
        • 2.Ra4#
      • 1...Sxf4!
    • 1.Raf3?
      • threat
        • 2.Sc5#
        • 2.Sg5#
      • 1...d3
        • 2.Re3#
      • 1...Sxf4!
    • 1.Rh5?
      • 1...Sxf4
        • 2.Sc5#
      • 1...Sh4
        • 2.Re5#
      • 1...Se5
        • 2.Rxe5#
      • 1...Se7
        • 2.Re5#
      • 1...Sf8
        • 2.Re5#
      • 1...Sh8
        • 2.Re5#
      • 1...d3!
  • Keys
    • 1.Ra5!
      • 1...Sxf4
        • 2.Sg5#
      • 1...Sh4
        • 2.Re5#
      • 1...Se5
        • 2.Rxe5#
      • 1...Se7
        • 2.Re5#
      • 1...Sf8
        • 2.Re5#
      • 1...Sh8
        • 2.Re5#
      • 1...d3
        • 2.Ra4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::R(A)
  • Tries
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • P(a);OGATEB::R(A)
      • Refutation
        • S(c);XP(C)
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);N_GUARD::R1(A)
      • Refutation
        • S(c);XP(C)
    • Try
      • R(B);
      • Vars
        • S(c);SBLOCK,XP(C)::S(F)
        • S(c);N_GUARD::R1(B)
        • S(c);N_GUARD::R1(B),XS(c)
      • Refutation
        • P(a);
  • Actual
    • R(A);
    • Vars
      • S(c);SBLOCK,XP(C)::S(F)
      • S(c);N_GUARD::R1(A)
      • S(c);N_GUARD::R1(A),XS(c)
      • P(a);OGATEB::R(A)
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