MESON Chess Problem Database

Problem Display
PID: 47742 (4bR2/6kp/8/3nKQ2/8/8/8/8 w - - 0 1)

Belchikov, Nikolai Ivanovich

Narodnaya gazeta, 1991

4bR2/6kp/8/3nKQ2/8/8/8/8

#2

3 + 4

145 StrateGems 2003
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Qf6#
    • 1...Se3
      • 2.Qf6#
    • 1...Sb4
      • 2.Qf6#
    • 1...Sf4
      • 2.Qf6#
    • 1...Sb6
      • 2.Qf6#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sc7
      • 2.Qf6#
    • 1...Se7
      • 2.Qf6#
  • Tries
    • 1.Rf7+?
      • 1...Kh6
        • 2.Rxh7#
      • 1...Kg8
        • 2.Qxh7#
      • 1...Kh8
        • 2.Qxh7#
      • 1...Bxf7!
    • 1.Rg8+?
      • 1...Kh6
        • 2.Qg5#
      • 1...Kxg8!
  • Keys
    • 1.Rh8!
      • threat
        • 2.Qxh7#
      • 1...Kh6
        • 2.Rxh7#
      • 1...Kxh8
        • 2.Qf8#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Bg6
        • 2.Qf8#
      • 1...h5
        • 2.Qh7#
      • 1...h6
        • 2.Qh7#

Anticipated by 203637(1924)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(C),XP(c)
        • K(b);P-FLIGHT::QAB1(B),XP(c)
        • K(b);S_FLIGHT::QAR1(B),XP(c)
      • Refutation
        • B(d);XR(C)
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);P-FLIGHT,XR(C)
  • Actual
    • R(C);
    • Threat
      • QAR1(B),XP(c)
    • Vars
      • K(b);P_SPINP(c),S_FLIGHT::R1(C),XP(c)
      • K(b);S_FLIGHT,XR(C)::QAR2(B)
      • S(a);N_GUARD::QAB1(B),XS(a)
      • B(d);SBLOCK::QAB1(B)
      • P(c);::QAR1(B)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).