MESON Chess Problem Database

Problem Display
PID: 140872 (8/8/1K1P2P1/2N5/1p1k4/1B4Qn/6n1/5N2 w - - 0 1)

Shabalin, Aleksandr Andreevich

Zatejnik, 1953

8/8/1K1P2P1/2N5/1p1k4/1B4Qn/6n1/5N2

#2

7 + 4

5454 Near Snap 2011
6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sgf4
      • 2.Qe3#
    • 1...Sh4
      • 2.Qe3#
  • Tries
    • 1.Qxh3?
      • threat
        • 2.Qh8#
      • 1...Sh4
        • 2.Qe3#
      • 1...Ke5!
    • 1.Qg5?
      • threat
        • 2.Qf6#
      • 1...Kc3
        • 2.Qd2#
        • 2.Qf6#
        • 2.Qe5#
      • 1...Sxg5!
    • 1.d7?
      • threat
        • 2.d8Q#
        • 2.d8R#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sgf4
        • 2.Qe3#
      • 1...Sg1
        • 2.d8Q#
        • 2.d8R#
      • 1...Se1
        • 2.Qe3#
        • 2.d8Q#
        • 2.d8R#
      • 1...Sh4
        • 2.Qe3#
        • 2.d8Q#
        • 2.d8R#
      • 1...Sf2
        • 2.d8Q#
        • 2.d8R#
      • 1...Sg5
        • 2.d8Q#
        • 2.d8R#
      • 1...Shf4!
  • Keys
    • 1.Qh2!
      • 1...Kc3
        • 2.Qe5#
      • 1...Sgf4
        • 2.Qb2#
      • 1...Shf4
        • 2.Qh8#
      • 1...Sg1
        • 2.Qh8#
      • 1...Se1
        • 2.Qb2#
      • 1...Se3
        • 2.Qb2#
      • 1...Sh4
        • 2.Qb2#
      • 1...Sf2
        • 2.Qh8#
      • 1...Sg5
        • 2.Qh8#

Anticipated by 4500(1871), 4501(1871), 230671(1879), 102776(1909)

This anticipates 163022(2014)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(C)
    • S(a);N_GUARD::QAB1(C),XS(a)
  • Tries
    • Try
      • Q(C);XS(b)
      • Threat
        • QAB(C)
      • Vars
        • S(a);N_GUARD::QAB1(C)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB(C)
      • Refutation
        • S(b);XQ(C)
    • Try
      • P(F);
      • Threat
        • P=Q
      • Vars
        • S(a);N_GUARD::QAB1(C),XS(a)
        • S(a);N_GUARD::QAB1(C)
        • S(b);::P=Q
      • Refutation
        • S(b);
  • Actual
    • Q(C);
    • Vars
      • K(d);S_FLIGHT::QAB(C)
      • S(a);OGATE::QAB(C)
      • S(b);OGATE::QAB(C)
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