MESON Chess Problem Database

Problem Display
PID: 181200 (Q4N2/7K/1BN5/1bPk4/4p2b/1P6/2P5/8 w - - 0 1)

Lopatinski, Evgeny

Prize, Fizicheskaya kultura, 1952

Q4N2/7K/1BN5/1bPk4/4p2b/1P6/2P5/8

#2

8 + 4

136 Problem Observer 2013
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.c4#
  • Tries
    • 1.Qc8?
      • threat
        • 2.Qe6#
        • 2.Qd7#
      • 1...e3
        • 2.Qe6#
      • 1...Bg3
        • 2.Qe6#
      • 1...Be7
        • 2.Qe6#
      • 1...Bxc6!
    • 1.Qd8+?
      • 1...Kxc6
        • 2.Qd7#
        • 2.Qa8#
      • 1...Bxd8!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sb4#
      • 1...Kxc6
        • 2.Qa8#
      • 1...Bxc6
        • 2.c4#
      • 1...e3
        • 2.Qh1#
      • 1...Be1
        • 2.Se7#

Anticipated by 143991(1909), 190187(1913)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD::P(A)
  • Tries
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAB1(G)
        • B(b);::QAB1(G)
      • Refutation
        • B(c);XS(E)
    • Try
      • Q(G);CHECK
      • Refutation
        • B(b);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • S(E)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XS(E)::QAB(G)
      • B(c);N_GUARD,SBLOCK,XS(E)::P(A)
      • P(a);OGATEB::QAB(G)
      • B(b);N_GUARD::S(E)
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