MESON Chess Problem Database

Problem Display
PID: 12253 (8/rp6/8/B6K/k1N4R/P7/3NB3/R7 w - - 0 1)

Lender, Baruch

diagrammes, 1976

8/rp6/8/B6K/k1N4R/P7/3NB3/R7

#2

8 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa5+
      • 2.Se5#
    • 1...b5
      • 2.Bd1#
  • Tries
    • 1.Bc3?
      • threat
        • 2.Sb2#
        • 2.Se3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sb6#
        • 2.Sd6#
      • 1...Ra5+
        • 2.Sxa5#
        • 2.Se5#
      • 1...b5
        • 2.Sb2#
        • 2.Sb6#
        • 2.Bd1#
      • 1...b6
        • 2.Sb2#
        • 2.Se3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sxb6#
        • 2.Sd6#
      • 1...Kb5!
    • 1.Bb6?
      • threat
        • 2.Sb2#
        • 2.Se3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sd6#
      • 1...Ra5+
        • 2.Sxa5#
        • 2.Se5#
      • 1...Kb5!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Scd2#
      • 1...Rxa5+
        • 2.Scxa5#
      • 1...Kxb3
        • 2.Bd1#
      • 1...Kb5
        • 2.Se5#
      • 1...b5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);CHECK,SBLOCK,XB(G)::R(F)+S(E)
    • P(c);SBLOCK::B(C)
  • Tries
    • Try
      • B(G);
      • Threat
        • DUALS(6)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(G);
      • Threat
        • DUALS(5)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • R(F)+S(E)
    • Vars
      • R(b);CHECK,XB(G)::R(F)+S(E),XR(b)
      • K(a);OGATEB,S_FLIGHT,XS(B)::B(C)
      • K(a);S_FLIGHT::B(C)+S(E)
      • P(c);SBLOCK::S(B)
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