MESON Chess Problem Database

Problem Display
PID: 139612 (3B2r1/qP1pp3/7b/1R2ppP1/4Nk1p/1R1QN2P/6pP/3B2K1 w - - 0 1)

Erokhin, Vladimir Alekseevich

Slovensky Dennik, 1991

3B2r1/qP1pp3/7b/1R2ppP1/4Nk1p/1R1QN2P/6pP/3B2K1

#2

12 + 10

6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3+
      • 2.Qxe3#
    • 1...Qb8
      • 2.Sxg2#
      • 2.Sd5#
    • 1...Qa1
      • 2.Sxg2#
      • 2.Sd5#
    • 1...Qa2
      • 2.Sd5#
    • 1...Qa3
      • 2.Sxg2#
      • 2.Sd5#
    • 1...Qa4
      • 2.Sxg2#
      • 2.Sd5#
    • 1...Qa5
      • 2.Sxg2#
      • 2.Sd5#
    • 1...Qa6
      • 2.Sxg2#
      • 2.Sd5#
    • 1...Qxb7
      • 2.Sxg2#
    • 1...Qa8
      • 2.Sxg2#
      • 2.Sd5#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Qxf5#
      • 1...Kxg5
        • 2.Qxf5#
      • 1...Qxe3
        • 2.Qxe3#
      • 1...Rxg5
        • 2.Sd5#
      • 1...e4
        • 2.Rxf5#
      • 1...e6
        • 2.Sxg2#
      • 1...Rf8!
    • 1.Qe2?
      • threat
        • 2.Qf3#
      • 1...Qxe3+
        • 2.Qxe3#
      • 1...fxe4
        • 2.Qg4#
      • 1...Kxe4!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Qxf5#
      • 1...Qxe3+
        • 2.Qxe3#
      • 1...Kxg5
        • 2.Qxf5#
      • 1...Rxg5
        • 2.Sd5#
      • 1...e4
        • 2.Rxf5#
      • 1...e6
        • 2.Sh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(g);CHECK,OGATE,XS(F)::QAB1(E),XQ(g)
    • Q(g);N_PINS(F)::S(F)
    • Q(g);N_PINS(F),XP(K)::S(F),XP(a)
  • Tries
    • Try
      • S(H);N_SPINS(F)
      • Threat
        • QAR1(E),XP(e)
      • Vars
        • K(b);P_SPINP(i),S_FLIGHT,XP(J)::QAR1(E),XP(e)
        • Q(g);OGATE,P_PINS(H),XS(F)::QAB1(E),XQ(g)
        • R(j);SBLOCK,XP(J)::S(F)
        • P(d);OGATE::R1(I),XP(e)
        • P(i);::S(F),XP(a)
      • Refutation
        • R(j);
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • Q(g);CHECK,OGATE,XS(F)::QAB1(E),XQ(g)
        • P(e);N_GUARD,SBLOCK,XS(H)::QAR1(E)
      • Refutation
        • K(b);P-FLIGHT,XS(H)
  • Actual
    • S(H);
    • Threat
      • QAR1(E),XP(e)
    • Vars
      • Q(g);CHECK,OGATE,XS(F)::QAB1(E),XQ(g)
      • K(b);S_FLIGHT,XP(J)::QAR1(E),XP(e)
      • R(j);SBLOCK,XP(J)::S(H)
      • P(d);OGATE::R1(I),XP(e)
      • P(i);::S(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).