MESON Chess Problem Database

Problem Display
PID: 46658 (5B1q/5p2/1K3p2/3k1P2/bpp1N1R1/2p3P1/n3RP2/1Q6 w - - 0 1)

Shanshin, Valery Yurevich

2nd Prize, The Problemist, 1999/II

5B1q/5p2/1K3p2/3k1P2/bpp1N1R1/2p3P1/n3RP2/1Q6

#2

9 + 9

56 The Problemist 2003
23 Die Schwalbe 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Sxf6#
    • 1...Ke5
      • 2.Sxc3#
    • 1...Qh1
      • 2.Sxf6#
    • 1...Qh2
      • 2.Sxf6#
    • 1...Qh3
      • 2.Sxf6#
    • 1...Qh5
      • 2.Sxf6#
    • 1...Qh7
      • 2.Sxf6#
    • 1...Qg8
      • 2.Sxf6#
  • Tries
    • 1.Sxc3+?
      • 1...bxc3
        • 2.Qe4#
      • 1...Sxc3!
    • 1.Qd3+?
      • 1...Ke5
        • 2.Sd2#
        • 2.Sxc3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
      • 1...cxd3!
    • 1.Qd1+?
      • 1...Ke5
        • 2.Sd6#
      • 1...Bxd1!
    • 1.Qh1?
      • threat
        • 2.Sxc3#
        • 2.Sxf6#
      • 1...Kd4
        • 2.Sc5#
      • 1...Ke5
        • 2.Sd6#
      • 1...Qxh1
        • 2.Sxf6#
      • 1...c2
        • 2.Sc3#
        • 2.Sxf6#
      • 1...Qxf8!
  • Keys
    • 1.Qxb4!
      • threat
        • 2.Qc5#
        • 2.Qd6#
      • 1...Kd4
        • 2.Qd6#
      • 1...Ke5
        • 2.Qc5#
      • 1...Qxf8
        • 2.Sxf6#
      • 1...Sxb4
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • K(f);P-FLIGHT::R(F)+S(E),XP(g)
    • K(f);P-FLIGHT::R(B)+S(E),XP(b)
    • Q(i);N_GUARD::S(E),XP(g)
  • Tries
    • Try
      • S(E);CHECK,XP(b)
      • Vars
        • P(d);XS(E)::QAB1(A)
      • Refutation
        • S(a);XS(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(e);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);P-FLIGHT::R(B)+S(E)
      • Refutation
        • B(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(f);P-FLIGHT::R(F)+S(E)
        • K(f);P-FLIGHT::R(B)+S(E)
        • Q(i);XQ(A)::S(E),XP(g)
      • Refutation
        • Q(i);XB(I)
  • Actual
    • Q(A);XP(d)
    • Threat
      • DUALS(2)
    • Vars
      • K(f);P-FLIGHT,P_SPINP(e)::QAR2(A)
      • K(f);P-FLIGHT::QAR2(A)
      • Q(i);N_GUARD,XB(I)::S(E),XP(g)
      • S(a);N_GUARD,XQ(A)::S(E),XP(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).