MESON Chess Problem Database

Problem Display
PID: 225124 (1b2N3/3p1p2/3PkP2/4np2/2P5/rBN1n2K/1Bp1R3/8 w - - 0 1)

Lipton, Michael

US Problem Bulletin, 1965

1b2N3/3p1p2/3PkP2/4np2/2P5/rBN1n2K/1Bp1R3/8

#2

9 + 9

254 Stella Polaris 1967

SOLUTION

  • SOUND
  • Sets
    • 1...S3xc4
      • 2.Bxc4#
    • 1...Sd5
      • 2.cxd5#
    • 1...S5xc4
      • 2.Rxe3#
  • Tries
    • 1.c5+?
      • 1...S3c4
        • 2.Bxc4#
      • 1...Sd5
        • 2.Bxd5#
      • 1...S5c4
        • 2.Rxe3#
      • 1...Rxb3!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sd4#
      • 1...S3xc4
        • 2.Rxe5#
      • 1...S5xc4
        • 2.Bxc4#
      • 1...Ba7
        • 2.Sbc7#
      • 1...Sd3
        • 2.Sg7#
      • 1...Sf3
        • 2.Sg7#
      • 1...S5g4
        • 2.Sg7#
      • 1...Sc6
        • 2.Sg7#
      • 1...Sg6
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • S(c);OGATE,P_SPINS(c),XP(F)::B(C),XS(c)
    • S(c);OGATE,P_SPINS(d)::P(F),XS(c)
    • S(d);OGATEB,P_SPINS(c),XP(F)::R(B),XS(c)
  • Tries
    • Try
      • P(F);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c),S_CUTS(d)::B(C),XS(c)
        • S(c);N_GUARD,P_SPINS(c)::B(C),XS(c)
        • S(d);P_SPINS(c),S_CUTR(b)::R(B),XS(c)
      • Refutation
        • R(b);XB(C)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • S(c);OGATE,P_PINB(C),P_SPINS(c),XP(F)::R1(B),XS(d)
      • S(d);OGATE,P_SPINS(c),XP(F)::B(C),XS(d)
      • B(i);N_GUARD::S(D)
      • S(d);P_SPINS(c)::S(I)
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