MESON Chess Problem Database

Problem Display
PID: 177766 (4b3/n2p4/K3p3/2N1N1R1/2Pkp1p1/pQ1pp1R1/2p4B/8 w - - 0 1)

Fedyakov, Sergey

1st HM., Sahs (Latvia), 1989

4b3/n2p4/K3p3/2N1N1R1/2Pkp1p1/pQ1pp1R1/2p4B/8

#2

8 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc5
      • 2.Qb6#
    • 1...d2
      • 2.Qxe3#
    • 1...d5
      • 2.Sxe6#
    • 1...d6
      • 2.Sxe6#
  • Tries
    • 1.Sa4?
      • threat
        • 2.Qc3#
        • 2.Qb6#
      • 1...c1Q
        • 2.Qb6#
      • 1...c1R
        • 2.Qb6#
      • 1...Sc8
        • 2.Qc3#
      • 1...Sb5!
    • 1.Sxe4?
      • threat
        • 2.Qxd3#
      • 1...Kxe4
        • 2.R3xg4#
      • 1...d2
        • 2.Qd3#
        • 2.Qxe3#
      • 1...c1S!
    • 1.Sf3+?
      • 1...exf3
        • 2.R3xg4#
        • 2.Qxd3#
      • 1...gxf3!
    • 1.Sc6+?
      • 1...dxc6
        • 2.Sxe6#
      • 1...Sxc6!
    • 1.Qb2+?
      • 1...Kxc5
        • 2.Qb6#
      • 1...axb2!
    • 1.Qb6?
      • threat
        • 2.Sa4#
      • 1...Kc3
        • 2.Sxe4#
      • 1...Sc8!
  • Keys
    • 1.R3xg4!
      • threat
        • 2.Sf3#
      • 1...Kxc5
        • 2.Qb6#
      • 1...e2
        • 2.Bg1#
      • 1...d5
        • 2.Sxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(e);OGATEB,S_FLIGHT,XS(E)::QAB1(B)
    • P(c);OGATE::QAB1(B),XP(d)
    • P(j);N_GUARD::S(E),XP(h)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAB(B)
        • S(i);::QAB1(B)
      • Refutation
        • S(i);
    • Try
      • S(E);XP(f)
      • Threat
        • QAR1(B),XP(c)
      • Vars
        • K(e);OGATEB,P-FLIGHT,XS(E)::R(C),XP(g)
      • Refutation
        • P(a);
    • Try
      • S(F);CHECK
      • Refutation
        • P(g);XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • P(j);XS(F)::S(E),XP(h)
      • Refutation
        • S(i);XS(F)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);OGATEB,S_FLIGHT,XS(E)::QAB1(B)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB(B)+S(E)
      • Vars
        • K(e);S_FLIGHT::S(E),XP(f)
      • Refutation
        • S(i);
  • Actual
    • R(C);P_PINP(f),XP(g)
    • Threat
      • S(F)
    • Vars
      • K(e);N_SPINP(f),OGATEB,S_FLIGHT,XS(E)::QAB1(B)
      • P(d);OGATEB::B(A)
      • P(j);N_GUARD::S(E),XP(h)
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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).