MESON Chess Problem Database

Problem Display
PID: 202550 (8/2R5/1p2N3/1pq2pKn/5R2/B1k1N3/P1pb3Q/1n3B1b w - - 0 1)

Ellerman, Arnoldo

Brisbane Courier, 1923

8/2R5/1p2N3/1pq2pKn/5R2/B1k1N3/P1pb3Q/1n3B1b

#2

9 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Sxd5#
    • 1...Bc1
      • 2.Qxc2#
    • 1...Be1
      • 2.Qxc2#
    • 1...Sg3
      • 2.Qh8#
    • 1...Sxf4
      • 2.Qh8#
  • Tries
    • 1.Rf3?
      • threat
        • 2.Qe5#
      • 1...Bxe3+
        • 2.Rxe3#
      • 1...f4+
        • 2.Sd5#
      • 1...Qxc7
        • 2.Qxc7#
      • 1...Bc1
        • 2.Qxc2#
      • 1...Be1
        • 2.Sd1#
        • 2.Sd5#
        • 2.Qxc2#
      • 1...Sg3
        • 2.Qh8#
      • 1...Sf4
        • 2.Sd1#
        • 2.Sd5#
        • 2.Qh8#
      • 1...Sxa3!
    • 1.Rc4+?
      • 1...Qxc4
        • 2.Qe5#
      • 1...bxc4!
  • Keys
    • 1.Re4!
      • threat
        • 2.Qe5#
      • 1...Bxe3+
        • 2.Rxe3#
      • 1...f4+
        • 2.Sd5#
      • 1...Qxc7
        • 2.Qxc7#
      • 1...Bc1
        • 2.Qxc2#
      • 1...Be1
        • 2.Sd5#
        • 2.Qxc2#
      • 1...Sg3
        • 2.Qh8#
      • 1...Sf4
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(b);N_GUARD::S(E),XB(b)
    • B(d);OGATE::QAR1(C),XP(c)
    • S(i);OGATE::QAB(C)
    • S(i);OGATE,XR(F)::QAB(C)
  • Tries
    • Try
      • R(F);P_SPINS(E)
      • Threat
        • QAB(C)
      • Vars
        • B(d);CHECK,OGATE,P_SPINB(d),XS(E)::R(F),XB(d)
        • P(h);CHECK,N_PINS(E)::R(F)+S(E),DCHECK
        • Q(g);N_SPINQ(g),OGATE,XR(I)::QAR(C),XQ(g)
        • B(d);OGATE::QAR1(C),XP(c)
        • S(i);OGATE::QAB(C)
      • Refutation
        • S(a);XB(D)
    • Try
      • R(F);CHECK,N_PINQ(g),P_SPINS(E)
      • Vars
        • Q(g);P_SPINQ(g),XR(F)::QAB(C)
      • Refutation
        • P(f);XR(F)
  • Actual
    • R(F);P_SPINS(E)
    • Threat
      • QAB(C)
    • Vars
      • B(d);CHECK,OGATE,XS(E)::R(F),XB(d)
      • P(h);CHECK,N_PINS(E)::S(E)
      • Q(g);N_SPINQ(g),OGATE,XR(I)::QAR(C),XQ(g)
      • B(d);OGATE::QAR1(C),XP(c)
      • S(i);OGATE::QAB(C)
      • S(i);N_PINS(E),OGATE::QAB(C)
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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).