MESON Chess Problem Database

Problem Display
PID: 97306 (1r1RRK2/1p1P1p1p/1QNkBn2/pP6/2p4r/4n3/3N4/8 w - - 0 1)

Stocchi, Ottavio

Le Probleme, 1949

1r1RRK2/1p1P1p1p/1QNkBn2/pP6/2p4r/4n3/3N4/8

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.dxc8S#
    • 1...Seg4
      • 2.Sxc4#
    • 1...Sfg4
      • 2.Se4#
    • 1...Sxd7+
      • 2.Rxd7#
  • Tries
    • 1.Bxf7?
      • threat
        • 2.Sb4#
        • 2.Sd4#
        • 2.Sxa5#
        • 2.Se5#
        • 2.Sa7#
        • 2.Sxb8#
      • 1...Rxd8
        • 2.Se5#
        • 2.Sb8#
      • 1...Sxe8
        • 2.dxe8S#
      • 1...bxc6
        • 2.Qxc6#
      • 1...Sed5
        • 2.Re6#
      • 1...Rd4
        • 2.Sb4#
        • 2.Sxd4#
        • 2.Sxa5#
        • 2.Se5#
        • 2.Sa7#
        • 2.Sxb8#
      • 1...Ra8
        • 2.Sb4#
        • 2.Sd4#
        • 2.Sxa5#
        • 2.Se5#
        • 2.Sa7#
        • 2.Sb8#
      • 1...Rc8
        • 2.dxc8S#
      • 1...Sfd5
        • 2.Re6#
      • 1...a4
        • 2.Sb4#
        • 2.Sd4#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sa7#
        • 2.Sxb8#
      • 1...Sxd7+!
    • 1.Qc5+?
      • 1...Kc7
        • 2.Sb4#
        • 2.Sd4#
        • 2.Sxa5#
        • 2.Se5#
        • 2.Sa7#
        • 2.Se7#
        • 2.Sxb8#
        • 2.b6#
      • 1...Kxc5!
  • Keys
    • 1.Bg4!
      • threat
        • 2.Sb4#
      • 1...Sxd7+
        • 2.Rxd7#
      • 1...Kd5
        • 2.Qd4#
      • 1...Sxe8
        • 2.dxe8S#
      • 1...bxc6
        • 2.Qxc6#
      • 1...Sed5
        • 2.Sxc4#
      • 1...Rc8
        • 2.dxc8S#
      • 1...Sfd5
        • 2.Se4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(j);OGATE::PXR(j)=S
    • S(a);N_GUARD,S_CUTR(c)::S(A),XP(b)
    • S(f);N_GUARD,S_CUTR(c)::S(A)
    • S(f);CHECK,OGATE,P_SPINS(f),XP(F)::R1(G),XS(f)
  • Tries
    • Try
      • B(E);XP(h)
      • Threat
        • DUALS(6)
      • Vars
        • S(f);OGATE,XR(H)::PXS(f)=S
        • P(g);OGATE,P_SPINP(g),XS(D)::QAR1(C),XP(g)
        • S(a);SBLOCK::R1(H)
        • R(j);OGATE::PXR(j)=S
        • S(f);SBLOCK::R1(H)
      • Refutation
        • S(f);CHECK,P_SPINS(f),XP(F)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(e);S_FLIGHT,XQ(C)
  • Actual
    • B(E);
    • Threat
      • QAR(C)+S(D)
    • Vars
      • S(f);CHECK,OGATE,P_SPINS(f),XP(F)::R1(G),XS(f)
      • K(e);P-FLIGHT::QAR1(C)
      • S(f);OGATE,XR(H)::PXS(f)=S
      • P(g);OGATE,P_SPINP(g),XS(D)::QAR1(C),XP(g)
      • S(a);N_GUARD,SBLOCK::S(A),XP(b)
      • R(j);OGATE::PXR(j)=S
      • S(f);N_GUARD,SBLOCK::S(A)
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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).