MESON Chess Problem Database

Problem Display
PID: 137474 (2bn3r/2R1P1N1/1p1B2R1/1p1k3N/2nr1P1p/8/B3P2K/1Q6 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1919

2bn3r/2R1P1N1/1p1B2R1/1p1k3N/2nr1P1p/8/B3P2K/1Q6

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Qxd3#
    • 1...Bf5
      • 2.Qxf5#
    • 1...Ba6
      • 2.Qf5#
    • 1...Bb7
      • 2.Qf5#
  • Tries
    • 1.Bb4?
      • threat
        • 2.Sf6#
        • 2.Rd6#
      • 1...Rxh5
        • 2.Rd6#
      • 1...Rd1
        • 2.Rd6#
      • 1...Rd2
        • 2.Rd6#
      • 1...Rd3
        • 2.Qxd3#
      • 1...Re4
        • 2.Rd6#
      • 1...Rh6
        • 2.Sf6#
      • 1...Rf8
        • 2.Rd6#
      • 1...Be6
        • 2.Sf6#
      • 1...Se6
        • 2.Sf6#
        • 2.Qf5#
      • 1...Sb7
        • 2.Sf6#
      • 1...Sf7
        • 2.Sf6#
      • 1...Rxf4!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Se3#
      • 1...Rxf4
        • 2.Sxf4#
      • 1...Bxf5
        • 2.Qxf5#
      • 1...Rd3
        • 2.Qxd3#
      • 1...Rd1
        • 2.e4#
      • 1...Rd2
        • 2.Qh1#
      • 1...Re4
        • 2.Qxb5#
      • 1...Be6
        • 2.Sf6#
      • 1...Se6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • R(b);OGATEB::QAR2(A),XR(b)
    • B(g);N_GUARD::QAR2(A),XB(g)
    • B(g);N_GUARD::QAR2(A)
  • Tries
    • Try
      • B(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(i);XS(F)::R1(H)
        • R(b);::R1(H)
        • R(b);P_PINP(C)::R1(H)
        • R(b);OGATEB::QAR2(A),XR(b)
        • R(i);::S(F)
        • R(i);::R1(H)
        • B(g);::S(F)
        • S(h);::S(F)
      • Refutation
        • R(b);XP(E)
  • Actual
    • S(K);
    • Threat
      • S(K)
    • Vars
      • R(b);XP(E)::S(F),XR(b)
      • B(g);OGATE,XS(K)::QAR2(A),XB(g)
      • R(b);OGATEB::QAR2(A),XR(b)
      • R(b);N_GUARD::P(C)
      • R(b);N_GUARD,P_PINP(C)::QAB(A)
      • R(b);SBLOCK::QAR2(A),XP(d)
      • B(g);SBLOCK::S(F)
      • S(h);SBLOCK::S(F)
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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).