MESON Chess Problem Database

Problem Display
PID: 115206 (1KN2R2/1p1k4/2p1p3/3n1b2/P2N4/BP1Q1P2/8/8 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

Canadian Chess Chat, 1981

1KN2R2/1p1k4/2p1p3/3n1b2/P2N4/BP1Q1P2/8/8

#2

9 + 6

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Sb6#
    • 1...Se3
      • 2.Sb6#
    • 1...Sf4
      • 2.Sb6#
    • 1...Sb6
      • 2.Sxb6#
    • 1...Sf6
      • 2.Sb6#
    • 1...Sc7
      • 2.Sb6#
    • 1...Se7
      • 2.Sb6#
    • 1...c5
      • 2.Qb5#
    • 1...e5
      • 2.Qxf5#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Sb6#
      • 1...c5
        • 2.Qb5#
      • 1...e5
        • 2.Qxf5#
      • 1...b6
        • 2.Sxb6#
      • 1...Bxd3!
    • 1.Se2?
      • threat
        • 2.Sb6#
      • 1...c5
        • 2.Qb5#
      • 1...e5
        • 2.Qxf5#
      • 1...b6
        • 2.Sxb6#
      • 1...Bxd3!
    • 1.Sxf5?
      • threat
        • 2.Sb6#
      • 1...exf5
        • 2.Qxf5#
      • 1...c5
        • 2.Qb5#
      • 1...b6
        • 2.Sxb6#
      • 1...e5!
    • 1.Sxe6?
      • threat
        • 2.Sc5#
      • 1...Kxe6
        • 2.Qxf5#
      • 1...Bxe6
        • 2.Sb6#
      • 1...c5
        • 2.Qxd5#
      • 1...b6!
    • 1.Qxf5?
      • threat
        • 2.Qxe6#
      • 1...Sf4
        • 2.Sb6#
        • 2.Qh7#
        • 2.Qf7#
      • 1...Sc7
        • 2.Sb6#
        • 2.Qh7#
        • 2.Qf7#
      • 1...exf5!
  • Keys
    • 1.Sxc6!
      • threat
        • 2.Se5#
      • 1...Kxc6
        • 2.Qb5#
      • 1...bxc6
        • 2.Sb6#
      • 1...e5
        • 2.Qxd5#

Anticipated by 10424(1964)

This anticipates 67805(1994)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • S(a);N_GUARD::S(H)
    • S(a);N_GUARD::S(H),XS(a)
    • P(c);OGATEB::QAB(C)
    • P(d);OGATEB::QAB(C),XB(b)
  • Tries
    • Try
      • S(F);P_PINS(a)
      • Threat
        • S(H)
      • Vars
        • P(c);OGATEB::QAB(C)
        • P(d);OGATEB::QAB(C),XB(b)
        • P(e);::S(H),XP(e)
      • Refutation
        • B(b);N_SPINS(a),XQ(C)
    • Try
      • S(F);P_PINS(a)
      • Threat
        • S(H)
      • Vars
        • P(c);OGATEB::QAB(C)
        • P(d);OGATEB::QAB(C),XB(b)
        • P(e);::S(H),XP(e)
      • Refutation
        • B(b);N_SPINS(a),XQ(C)
    • Try
      • S(F);P_PINS(a),XB(b)
      • Threat
        • S(H)
      • Vars
        • P(d);OGATE,XS(F)::QAB(C),XP(d)
        • P(c);OGATEB::QAB(C)
        • P(e);::S(H),XP(e)
      • Refutation
        • P(d);
    • Try
      • S(F);P_PINS(a),XP(d)
      • Threat
        • S(F)
      • Vars
        • K(f);N_SPINS(a),OGATEB,S_FLIGHT,XS(F)::QAB1(C),XB(b)
        • B(b);SBLOCK,XS(F)::S(H)
        • P(c);N_GUARD::QAR2(C),XS(a)
      • Refutation
        • P(e);
    • Try
      • Q(C);P_PINP(d),XB(b)
      • Threat
        • QAB1(C),XP(d)
      • Refutation
        • P(d);N_SPINP(d),XQ(C)
  • Actual
    • S(F);P_PINS(a),XP(c)
    • Threat
      • S(F)
    • Vars
      • K(f);N_SPINS(a),OGATEB,S_FLIGHT,XS(F)::QAB1(C)
      • P(e);SBLOCK,XS(F)::S(H)
      • P(d);N_GUARD::QAR2(C),XS(a)
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