MESON Chess Problem Database

Problem Display
PID: 203394 (8/4N3/4p3/4k1P1/2pR2pn/8/5P2/1Kn2QB1 w - - 0 1)

Sokolenko, TA

Shakhmaty, 1924

8/4N3/4p3/4k1P1/2pR2pn/8/5P2/1Kn2QB1

#2

7 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Sc6#
    • 1...g3
      • 2.f4#
  • Tries
    • 1.Qe2+?
      • 1...Kxd4
        • 2.Qe3#
      • 1...Sxe2!
    • 1.Qxc1?
      • threat
        • 2.Qe3#
        • 2.Qf4#
      • 1...Kxd4
        • 2.Qe3#
      • 1...Sf5
        • 2.Sc6#
        • 2.Qf4#
      • 1...Sg6
        • 2.Qe3#
      • 1...Sg2!
    • 1.Qe1+?
      • 1...Kxd4
        • 2.Qe3#
      • 1...Se2!
  • Keys
    • 1.Qh3!
      • threat
        • 2.Qe3#
      • 1...Kxd4
        • 2.Qe3#
      • 1...gxh3
        • 2.f4#
      • 1...Sg2
        • 2.Qh8#
      • 1...Sf3
        • 2.Qh8#
      • 1...Sf5
        • 2.Sc6#
      • 1...g3
        • 2.Sc6#
        • 2.f4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(d);SBLOCK::S(G)
    • P(c);N_GUARD::P(D)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);S_FLIGHT,XR(E)::QAB1(B)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(e);S_FLIGHT,XR(E)::QAB1(B)
        • S(d);::QAR2(B)
      • Refutation
        • S(d);
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);S_FLIGHT,XR(E)::QAB1(B)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • K(e);S_FLIGHT,XR(E)::QAB1(B)
      • P(c);N_GUARD,XQ(B)::P(D)
      • S(d);OGATE::QAB(B)
      • S(d);SBLOCK::S(G)
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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).