MESON Chess Problem Database

Problem Display
PID: 170864 (4b1n1/Q1pn4/P7/Pk2p3/1P5R/K1pp4/5N2/7B w - - 0 1)

Permyakov, Evgeni Nikolaevich

StrateGems, 2017

4b1n1/Q1pn4/P7/Pk2p3/1P5R/K1pp4/5N2/7B

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sdf6
      • 2.Qb7#
    • 1...Sb8
      • 2.Qb7#
    • 1...Sf8
      • 2.Qb7#
  • Tries
    • 1.Sd1?
      • threat
        • 2.Sxc3#
      • 1...c2
        • 2.Sc3#
      • 1...e4!
    • 1.Qxc7?
      • threat
        • 2.Qc4#
        • 2.Qc6#
      • 1...Kxa6
        • 2.Qb7#
      • 1...Bf7
        • 2.Qc6#
      • 1...Sc5
        • 2.Qb6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sdf6
        • 2.Qb6#
        • 2.Qc4#
        • 2.Qb7#
      • 1...Sb8
        • 2.Qb6#
        • 2.Qc4#
        • 2.Qb7#
      • 1...Sf8
        • 2.Qb6#
        • 2.Qc4#
        • 2.Qb7#
      • 1...Se7
        • 2.Qc4#
      • 1...e4!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sxc3#
      • 1...Kc4
        • 2.Sd6#
      • 1...Kc6
        • 2.Qb7#
      • 1...c2
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(f);N_GUARD::QAR2(H)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B),XP(a)
      • Vars
        • P(a);::S(B)
      • Refutation
        • P(d);
    • Try
      • Q(H);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);S_FLIGHT,XP(G)::QAB1(H)
        • B(g);::QAB1(H)
        • S(f);N_GUARD::QAR1(H)
        • S(f);N_GUARD::QAR1(H),XS(f)
        • S(h);::QAB1(H)
      • Refutation
        • P(d);
  • Actual
    • S(B);
    • Threat
      • S(B),XP(a)
    • Vars
      • K(c);S_FLIGHT::R(E)+S(B),DCHECK
      • K(c);S_FLIGHT::QAB1(H)
      • P(a);::S(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).