MESON Chess Problem Database

Problem Display
PID: 64689 (3rbbq1/1PPkppR1/2p4R/3p3N/6n1/1K2Np1B/4Q2B/8 w - - 0 1)

Ivanov, Nikolai

4th Prize, Vecherni Leningrad, 1981

3rbbq1/1PPkppR1/2p4R/3p3N/6n1/1K2Np1B/4Q2B/8

#2

10 + 11

3752 FIDE Album (1980-1982) 1988

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Qb5#
  • Tries
    • 1.Sxg4?
      • threat
        • 2.Sgf6#
      • 1...e6
        • 2.Qxe6#
      • 1...c5
        • 2.Qb5#
      • 1...f6
        • 2.Sgxf6#
        • 2.Shxf6#
      • 1...e5!
    • 1.Sf6+?
      • 1...Ke6
        • 2.Bxg4#
        • 2.cxd8S#
      • 1...exf6!
    • 1.b8S+?
      • 1...Kc8
        • 2.Qa6#
      • 1...Rxb8+!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Sb6#
      • 1...cxd5
        • 2.Qb5#
      • 1...e5
        • 2.Bxg4#
      • 1...e6
        • 2.Qxe6#
      • 1...f5
        • 2.Rd6#
      • 1...f6
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(d);OGATEB::QAB(A)
  • Tries
    • Try
      • S(D);XS(b)
      • Threat
        • B(E)+S(D),DCHECK
      • Vars
        • P(f);P_SPINP(g)::QAB1(A),XP(f)
        • P(d);OGATEB::QAB(A)
      • Refutation
        • P(f);P_SPINP(g)
    • Try
      • S(F);CHECK
      • Refutation
        • P(f);P_SPINP(g),XS(F)
    • Try
      • P(H);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB(A)
      • Refutation
        • R(h);CHECK,XS(H)
  • Actual
    • S(D);XP(c)
    • Threat
      • S(D)
    • Vars
      • P(d);OGATEB,XS(D)::QAB(A)
      • P(f);N_GUARD,P_SPINP(g)::B(E),XS(b)
      • P(f);N_SPINS(b),P_SPINP(g)::QAB1(A),XP(f)
      • P(g);N_SPINS(b),P_PINS(D),P_SPINP(f)::R1(G)
      • P(g);P_PINS(D),P_SPINP(f)::S(F),XP(g)
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