MESON Chess Problem Database

Problem Display
PID: 215664 (8/2K5/8/2k5/7Q/2NP4/2nn4/8 w - - 0 1)

Zalokotsky, Roman Fedorovich (aka Fedorovich, Roman)

Land og Folk, 1979

8/2K5/8/2k5/7Q/2NP4/2nn4/8

#2

4 + 3

15148 Sadier Collection 2020
3713 Snap 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qf2#
    • 1...Sd4
      • 2.Qe7#
    • 1...Sb1
      • 2.Qc4#
    • 1...Sf1
      • 2.Qc4#
    • 1...Sb3
      • 2.Qc4#
    • 1...Sf3
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qd6#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se4!
  • Keys
    • 1.Qa4!
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sa1
        • 2.d4#
      • 1...Se1
        • 2.d4#
      • 1...Sa3
        • 2.d4#
      • 1...Se3
        • 2.d4#
      • 1...Sd4
        • 2.Qa3#
      • 1...Sb1
        • 2.Qc4#
      • 1...Sf1
        • 2.Qc4#
      • 1...Sb3
        • 2.Qc4#
      • 1...Sf3
        • 2.Qc4#
      • 1...Se4
        • 2.Qc4#

Anticipated by 254545(1936), 18667(1957), 142144(1974), 108396(1975)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,SBLOCK::QAB(C)
    • S(a);SBLOCK::QAB(C)
    • S(b);N_GUARD::QAR1(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • S(b);
  • Actual
    • Q(C);
    • Vars
      • S(a);SBLOCK::QAB(C)
      • S(b);N_GUARD::QAR1(C),XS(b)
      • S(a);N_GUARD::P(B)
      • S(a);N_GUARD,SBLOCK::QAB(C)
      • S(b);N_GUARD::QAR1(C)
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