MESON Chess Problem Database

Problem Display
PID: 48932 (1r1b4/BnP5/2P5/1PNkPP2/p5r1/1qR2b2/B1NpR1Qn/3K4 w - - 0 1)

Ellerman, Arnoldo

Estrategia, 1942

1r1b4/BnP5/2P5/1PNkPP2/p5r1/1qR2b2/B1NpR1Qn/3K4

#2

13 + 10

5137 1001 Problemas 1945

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Qg8#
    • 1...Rc4
      • 2.Qg8#
    • 1...Rd4
      • 2.Qg8#
    • 1...Rf4
      • 2.Qg8#
    • 1...Rh4
      • 2.Qg8#
    • 1...Rg8
      • 2.Qxg8#
    • 1...Sxc5
      • 2.Rxc5#
  • Tries
    • 1.Sxb7?
      • threat
        • 2.Rc5#
      • 1...Qc4
        • 2.Sb4#
      • 1...Rc4
        • 2.Qg8#
      • 1...Be7!
    • 1.Bxb3+?
      • 1...Rc4
        • 2.Bxc4#
        • 2.Rd3#
        • 2.Qg8#
      • 1...axb3!
    • 1.Rd3+?
      • 1...Rd4
        • 2.Rxd4#
        • 2.Qg8#
      • 1...Kc4!
    • 1.Qxf3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Sxf3!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Sb6#
      • 1...Bxc7
        • 2.Sf6#
      • 1...Qc4
        • 2.Sb4#
      • 1...Rc4
        • 2.Qg8#
      • 1...Re4
        • 2.Qg8#
      • 1...Be4
        • 2.Rxd2#
      • 1...Sa5
        • 2.Rc5#
      • 1...Sc5
        • 2.Rxc5#
      • 1...Sd6
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • R(f);OGATE::QAB(E)
    • R(f);N_SPINQ(c),OGATE::QAB(E)
    • R(f);OGATE::QAB(E),XR(f)
    • S(h);OGATE,XS(H)::R1(F),XS(h)
  • Tries
    • Try
      • S(H);XS(h)
      • Threat
        • R1(F)
      • Vars
        • Q(c);N_PINS(C)::S(C)
        • R(f);N_SPINQ(c),OGATE::QAB(E)
      • Refutation
        • B(j);
    • Try
      • B(B);CHECK,N_SPINS(C),XQ(c)
      • Refutation
        • P(e);XB(B)
    • Try
      • R(F);CHECK
      • Refutation
        • K(g);N_SPINB(d),S_FLIGHT
    • Try
      • Q(E);CHECK,N_SPINR(D),XB(d)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(E),XR(f)
      • Refutation
        • S(b);XQ(E)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • B(j);N_GUARD,XP(M)::S(H)
      • Q(c);N_PINS(C)::S(C)
      • R(f);N_SPINQ(c),OGATE::QAB(E)
      • R(f);N_SPINB(d),OGATE::QAB(E)
      • B(d);N_PINR(D)::R(D),XP(a)
      • S(h);N_GUARD::R1(F)
      • S(h);N_GUARD::R1(F),XS(h)
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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).