MESON Chess Problem Database

Problem Display
PID: 229123 (8/8/b4B1n/2QN1p2/r3k3/1r2N2K/6Pb/4R3 w - - 0 1)

Ellerman, Arnoldo

L'Echiquier, 1926

8/8/b4B1n/2QN1p2/r3k3/1r2N2K/6Pb/4R3

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Qc2#
    • 1...Rxe3+
      • 2.Rxe3#
    • 1...Rb5
      • 2.Qc2#
    • 1...Ra1
      • 2.Qd4#
    • 1...Ra2
      • 2.Qd4#
    • 1...Ra3
      • 2.Qd4#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Ra5
      • 2.Qd4#
    • 1...Bc4
      • 2.Qd4#
  • Tries
    • 1.Sc3+?
      • 1...Kd3
        • 2.Rd1#
      • 1...Kf4
        • 2.Sed5#
        • 2.Qd6#
        • 2.Qe5#
        • 2.Qc7#
      • 1...Rxc3!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qe5#
      • 1...Rxe3+
        • 2.Qxe3#
      • 1...Kxf4
        • 2.Qe5#
      • 1...Bxf4
        • 2.Qd5#
      • 1...Rb5
        • 2.Sed5#
      • 1...Ra5
        • 2.Qd4#
      • 1...Sg4
        • 2.Qxf5#
      • 1...Sf7
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • K(d);N_PINS(C),S_FLIGHT::QAB1(E)
    • R(b);CHECK,OGATE,P_SPINR(b),XS(C)::R1(A),XR(b)
    • R(b);N_GUARD,N_PINS(C),S_CUTB(f)::QAB(E)
    • R(c);N_GUARD::QAR1(E)
    • R(c);N_GUARD::QAR1(E),XR(c)
    • B(f);S_CUTR(c)::QAR1(E)
  • Tries
    • Try
      • S(F);CHECK,N_SPINS(C)
      • Vars
        • K(d);S_FLIGHT::R(A)
      • Refutation
        • R(b);P_PINS(C),XS(F)
  • Actual
    • S(F);
    • Threat
      • QAR1(E)
    • Vars
      • R(b);CHECK,OGATE,P_SPINR(b),XS(C)::QAR1(E),XR(b)
      • K(d);P-FLIGHT,XS(F)::QAB1(E)
      • B(a);SBLOCK,XS(F)::QAB1(E)
      • R(b);N_PINS(C)::R(A)+S(C)
      • R(c);N_GUARD::QAR1(E)
      • S(g);N_GUARD::QAB1(E),XP(e)
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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).