MESON Chess Problem Database

Problem Display
PID: 103617 (2nn1bK1/3PkPp1/q3P1R1/B2p2N1/B4Q2/4R3/8/8 w - - 0 1)

Keirans, Arturs

Rigaer Rundschau, 1938

2nn1bK1/3PkPp1/q3P1R1/B2p2N1/B4Q2/4R3/8/8

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.dxc8S#
    • 1...Qe2
      • 2.dxc8S#
    • 1...Qd3
      • 2.dxc8S#
    • 1...Qb5
      • 2.dxc8S#
    • 1...Qxa5
      • 2.dxc8S#
    • 1...Qb6
      • 2.dxc8S#
    • 1...Qd6
      • 2.dxc8S#
    • 1...Qxe6
      • 2.dxc8S#
    • 1...Qa7
      • 2.dxc8S#
    • 1...Sb6
      • 2.Bb4#
      • 2.Qb4#
    • 1...Sxe6
      • 2.d8Q#
      • 2.d8B#
    • 1...Sb7
      • 2.dxc8S#
  • Tries
    • 1.Bb4+?
      • 1...Qd6
        • 2.dxc8S#
      • 1...Sd6!
    • 1.Qc7?
      • threat
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Qxe6
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Sxe6
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
        • 2.d8Q#
        • 2.d8S#
        • 2.d8B#
        • 2.d8R#
      • 1...Sxf7
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
        • 2.d8Q#
        • 2.d8S#
        • 2.d8B#
        • 2.d8R#
      • 1...Qf1
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Qe2
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Qd3
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Qa8
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Sb6
        • 2.Bb4#
        • 2.Qc5#
      • 1...Sd6
        • 2.Qxd8#
      • 1...Sc6
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
        • 2.d8Q#
        • 2.d8S#
        • 2.d8B#
        • 2.d8R#
      • 1...Sb7
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
        • 2.d8Q#
        • 2.d8S#
        • 2.d8B#
        • 2.d8R#
      • 1...d4
        • 2.dxc8Q#
        • 2.dxc8S#
        • 2.dxc8B#
        • 2.dxc8R#
      • 1...Sa7!
    • 1.Qb4+?
      • 1...Qd6
        • 2.dxc8S#
      • 1...Sd6!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Se4#
      • 1...Kd6
        • 2.Qb4#
      • 1...Qxe6
        • 2.dxc8S#
      • 1...Sxe6
        • 2.d8Q#
      • 1...Sxf7
        • 2.Sxf7#
      • 1...Qf1
        • 2.dxc8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::PXS(e)=S
    • Q(b);N_GUARD,XB(D)::PXS(e)=S
    • Q(b);N_GUARD,P_PINP(I),P_SPINQ(b),XP(F)::PXS(e)=S
    • S(f);OGATE,P_SPINS(f),XP(F)::P=Q
    • S(f);S_CUTQ(b)::PXS(e)=S
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::PXS(e)=S
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • Q(C);
      • Threat
        • DUALS(4)
      • Vars
        • S(e);SBLOCK::QAB1(C),XS(f)
      • Refutation
        • S(e);
    • Try
      • Q(C);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::PXS(e)=S
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+S(E)
    • Vars
      • K(c);S_FLIGHT::QAB(C)
      • Q(b);N_GUARD,P_PINP(I),P_SPINQ(b),XP(F)::PXS(e)=S
      • S(f);OGATE,P_SPINS(f),XP(F)::P=Q
      • S(f);XP(I)::QAB(C)+S(E),XS(f)
      • Q(b);N_GUARD::PXS(e)=S
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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).