MESON Chess Problem Database

Problem Display
PID: 157052 (4N2K/2r1pB2/r1p1N1Q1/1Rpbk1p1/4Pp2/2bR2n1/3n4/4B3 w - - 0 1)

Lukashev, Viktor Sergeevich

Best Problems, 2007

4N2K/2r1pB2/r1p1N1Q1/1Rpbk1p1/4Pp2/2bR2n1/3n4/4B3

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe6
      • 2.Qxe6#
    • 1...Sdf1
      • 2.Bxc3#
    • 1...Sc4
      • 2.Bxc3#
    • 1...Sgf1
      • 2.Qf5#
    • 1...Sh1
      • 2.Qf5#
    • 1...Se2
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sh5
      • 2.Qf5#
    • 1...f3
      • 2.Bxg3#
    • 1...cxb5
      • 2.Rxd5#
  • Tries
    • 1.Sxg5?
      • threat
        • 2.Qg7#
      • 1...Bxe4
        • 2.Qe6#
      • 1...Sdxe4
        • 2.Sf3#
      • 1...cxb5
        • 2.Rxd5#
      • 1...f3
        • 2.Bxg3#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sh5
        • 2.Qf5#
      • 1...Sgxe4!
    • 1.Qxg5+?
      • 1...Sf5
        • 2.Qxf4#
        • 2.Qxf5#
      • 1...Kxe4+!
    • 1.Qf6+?
      • 1...Kxe4
        • 2.Sxc5#
      • 1...exf6!
  • Keys
    • 1.Re3!
      • threat
        • 2.Qg7#
      • 1...Bxe4
        • 2.Rxc5#
      • 1...Sdxe4
        • 2.Bxc3#
      • 1...Sgxe4
        • 2.Qxg5#
      • 1...fxe3
        • 2.Bxg3#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sh5
        • 2.Qf5#
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • B(f);OGATE,P_SPINP(e),XS(E)::QAR1(F),XB(f)
    • S(a);OGATE::B(A),XB(b)
    • S(c);N_GUARD::QAR1(F)
    • S(c);N_GUARD::QAR1(F),XS(c)
    • P(d);OGATEB::B(A),XS(c)
    • P(j);N_GUARD,XR(D)::R1(B),XB(f)
  • Tries
    • Try
      • S(E);XP(h)
      • Threat
        • QAB(F)
      • Vars
        • B(f);N_GUARD,P_SPINP(e),XP(C)::QAR1(F)
        • S(a);N_GUARD,XP(C)::S(E)
        • P(j);N_GUARD,XR(D)::R1(B),XB(f)
        • P(d);OGATEB::B(A),XS(c)
        • S(c);N_GUARD::QAR1(F),XS(c)
        • S(c);N_GUARD::QAR1(F)
      • Refutation
        • S(c);XP(C)
    • Try
      • Q(F);CHECK,XP(h)
      • Refutation
        • K(g);CHECK,P-FLIGHT,XP(C)
    • Try
      • Q(F);CHECK
      • Vars
        • K(g);P-FLIGHT,P_PINQ(F),XP(C)::S(E),XP(e)
      • Refutation
        • P(l);XQ(F)
  • Actual
    • R(B);
    • Threat
      • QAB(F)
    • Vars
      • B(f);OGATEB,P_SPINB(f),P_SPINP(e),XP(C)::R(D),XP(e)
      • S(a);OGATE,P_SPINS(a),XP(C)::B(A),XB(b)
      • S(c);N_GUARD,P_SPINS(c),XP(C)::QAR2(F),XP(h)
      • P(d);OGATEB,XR(B)::B(A),XS(c)
      • S(c);N_GUARD::QAR1(F),XS(c)
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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).