MESON Chess Problem Database

Problem Display
PID: 139398 (5r2/1p2n3/b2pB1R1/3Pkp2/3r1N1Q/p2p4/1R1N4/B2K4 w - - 0 1)

Ellerman, Arnoldo

Norsk Sjakkblad, 1919

5r2/1p2n3/b2pB1R1/3Pkp2/3r1N1Q/p2p4/1R1N4/B2K4

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Rb4#
    • 1...Rb4
      • 2.Rxb4#
    • 1...Rc4
      • 2.Sxd3#
    • 1...Re4
      • 2.Sf3#
    • 1...Rxd5
      • 2.Rb5#
    • 1...Sxg6
      • 2.Sxg6#
  • Tries
    • 1.Sxd3+?
      • 1...Bxd3
        • 2.Sf3#
      • 1...Rxd3!
    • 1.Qe1+?
      • 1...Kxf4
        • 2.Qg3#
      • 1...Re4!
    • 1.Qf6+?
      • 1...Kxf4
        • 2.Qxd4#
      • 1...Rxf6!
  • Keys
    • 1.Bf7!
      • threat
        • 2.Re6#
      • 1...Rxf4
        • 2.Qf6#
      • 1...Rxd5
        • 2.Rb5#
      • 1...Sxg6
        • 2.Sxg6#
      • 1...Ra4
        • 2.Rb4#
      • 1...Rb4
        • 2.Rxb4#
      • 1...Rc4
        • 2.Sxd3#
      • 1...Re4
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATEB::B(A)+R(C)
    • R(c);OGATEB::B(A)+R(C),XR(c)
    • R(c);N_GUARD,S_CUTB(f)::S(E),XP(b)
    • R(c);SBLOCK::S(D)
    • R(c);OGATEB,XP(G)::B(A)+R(C)
    • S(i);XR(I)::S(E),XS(i)
  • Tries
    • Try
      • S(E);CHECK,XP(b)
      • Vars
        • B(f);XS(E)::S(D)
      • Refutation
        • R(c);P_PINS(D),XS(E)
    • Try
      • Q(F);CHECK
      • Vars
        • K(d);OGATEB,S_FLIGHT,XS(E)::QAB1(F)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(F);CHECK
      • Vars
        • K(d);OGATE,P_SPINP(e),S_FLIGHT,XS(E)::QAR2(F),XR(c)
      • Refutation
        • R(j);XQ(F)
  • Actual
    • B(H);
    • Threat
      • R1(I)
    • Vars
      • R(c);SBLOCK,XS(E)::QAB1(F)
      • R(c);OGATEB,XP(G)::B(A)+R(C)
      • S(i);XR(I)::S(E),XS(i)
      • R(c);OGATEB::B(A)+R(C)
      • R(c);OGATEB::B(A)+R(C),XR(c)
      • R(c);N_GUARD,S_CUTB(f)::S(E),XP(b)
      • R(c);SBLOCK::S(D)
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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).