MESON Chess Problem Database

Problem Display
PID: 197857 (R7/8/8/n7/8/R7/P1P5/k1K5 w - - 0 1)

Sheyanov, Alexei

Zadachi i Etyudi, 1997

R7/8/8/n7/8/R7/P1P5/k1K5

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3+
      • 2.axb3#
  • Tries
    • 1.Rb8?
      • threat
        • 2.Rb1#
      • 1...Sb3+
        • 2.axb3#
      • 1...Sb7!
  • Keys
    • 1.Rb3!
      • 1...Sxb3+
        • 2.axb3#
      • 1...Kxa2
        • 2.Rxa5#
      • 1...Sc4
        • 2.Rb1#
      • 1...Sc6
        • 2.Rb1#
      • 1...Sb7
        • 2.Rb1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(b);CHECK,OGATE::R(D)+P(B),XS(b)
  • Tries
    • Try
      • R(E);
      • Threat
        • R1(E)
      • Vars
        • S(b);CHECK,OGATE::R(D)+P(B),XS(b)
      • Refutation
        • S(b);
  • Actual
    • R(D);
    • Vars
      • S(b);CHECK,OGATE,XR(D)::R(E)+P(B),XS(b)
      • K(a);OGATEB,P-FLIGHT,P_SPINS(b),XP(B)::R(E),XS(b)
      • S(b);::R1(D)
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