MESON Chess Problem Database

Problem Display
PID: 135183 (8/N1P5/2B5/P1k1Pp1K/1nbn1N2/7Q/8/2R5 w - - 0 1)

Ivanov, Vadim Aleksandrovich

Comm., Die Schwalbe, 2009

8/N1P5/2B5/P1k1Pp1K/1nbn1N2/7Q/8/2R5

#2

9 + 5

23 Die Schwalbe 2012
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Sd3#
    • 1...Sd3
      • 2.Sxd3#
    • 1...Sd5
      • 2.Sd3#
    • 1...Sa6
      • 2.Sd3#
    • 1...Se2
      • 2.Se6#
    • 1...Sb3
      • 2.Se6#
    • 1...Sf3
      • 2.Se6#
    • 1...Sb5
      • 2.Se6#
    • 1...Se6
      • 2.Sxe6#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...Sxb3
        • 2.Se6#
      • 1...Sbc2
        • 2.Qb6#
      • 1...Sdc2!
    • 1.Qd3?
      • threat
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...Sxd3
        • 2.Sxd3#
      • 1...Sdc2
        • 2.Qd6#
      • 1...Sbc2!
    • 1.c8Q?
      • threat
        • 2.Qf8#
      • 1...Sbxc6
        • 2.Qa3#
      • 1...Sdxc6
        • 2.Qe3#
      • 1...Sd5
        • 2.Sd3#
      • 1...Se2
        • 2.Se6#
      • 1...Sb3
        • 2.Se6#
      • 1...Sf3
        • 2.Se6#
      • 1...Sb5
        • 2.Se6#
      • 1...Se6
        • 2.Sxe6#
      • 1...Sdc2!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qxc4#
      • 1...Sbc2
        • 2.Sd3#
      • 1...Sdc2
        • 2.Se6#

Anticipated by 106062(1996), 197861(1997)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • S(a);N_GUARD::S(C)
    • S(a);N_GUARD::S(C),XS(a)
    • S(c);N_GUARD::S(C)
    • S(c);N_GUARD::S(C),XS(c)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD,XQ(B)::S(C)
        • S(a);N_SPINB(b),OGATE::QAB1(B)
      • Refutation
        • S(c);N_SPINB(b)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);XQ(B)::S(C),XS(a)
        • S(c);N_SPINB(b),OGATE::QAB1(B)
      • Refutation
        • S(a);N_SPINB(b)
    • Try
      • P(I);
      • Threat
        • QAB(I)
      • Vars
        • S(a);OGATEB,P_SPINS(a),XB(G)::QAB(B)
        • S(c);OGATEB,P_SPINS(c),XB(G)::QAB(B)
        • S(a);N_GUARD::S(C)
        • S(c);N_GUARD::S(C)
        • S(c);N_GUARD::S(C),XS(c)
      • Refutation
        • S(c);N_SPINB(b)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XB(b)
    • Vars
      • S(a);N_GUARD::S(C)
      • S(c);N_GUARD::S(C)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).