MESON Chess Problem Database

Problem Display
PID: 59537 (r7/3P1KB1/1pN1BQ2/6p1/p5R1/k4rRn/4p1q1/2b5 w - - 0 1)

Ellerman, Arnoldo

3rd HM., Brisbane Courier, 1922-1923

r7/3P1KB1/1pN1BQ2/6p1/p5R1/k4rRn/4p1q1/2b5

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Qa1#
    • 1...Rc3
      • 2.Qxc3#
    • 1...Rd3
      • 2.Rxd3#
      • 2.Qa1#
      • 2.Qe7#
    • 1...Re3
      • 2.Qa1#
      • 2.Qe7#
    • 1...Rxg3
      • 2.Qa1#
      • 2.Qe7#
    • 1...Ra6
      • 2.Bf8#
    • 1...Ra7
      • 2.Bf8#
    • 1...Rf8+
      • 2.Bxf8#
    • 1...Bf4
      • 2.Qa1#
      • 2.Qb2#
    • 1...Sf4
      • 2.Qa1#
      • 2.Qe7#
  • Tries
    • 1.Rxf3+?
      • 1...Be3
        • 2.Rxe3#
        • 2.Qa1#
        • 2.Qb2#
        • 2.Qc3#
        • 2.Qe7#
      • 1...Qxf3!
    • 1.Qxf3+?
      • 1...Be3
        • 2.Qxe3#
      • 1...Qxf3+!
  • Keys
    • 1.Sa7!
      • threat
        • 2.Sb5#
      • 1...Rf8+
        • 2.Bxf8#
      • 1...Rxa7
        • 2.Bf8#
      • 1...Rb3
        • 2.Qa1#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Bf4
        • 2.Qb2#
      • 1...Sf4
        • 2.Qe7#
      • 1...b5
        • 2.Sxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(e);N_PINQ(E)::QAR2(E)
    • R(e);N_PINQ(E)::QAR2(E),XR(e)
    • R(j);N_GUARD::B(H)
    • R(j);N_GUARD,P_PINP(F)::B(H)
    • R(j);CHECK,N_GUARD::B(H),XR(j)
  • Tries
    • Try
      • R(A);CHECK,N_SPINQ(E),XR(e)
      • Refutation
        • Q(c);P_PINQ(E),XR(A)
    • Try
      • Q(E);CHECK,N_SPINQ(E),XR(e)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR(E),XB(a)
      • Refutation
        • Q(c);CHECK,P_SPINQ(c),XQ(E)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • R(j);CHECK,N_GUARD::B(H),XR(j)
      • R(j);N_GUARD,P_PINP(F),XS(C)::B(H)
      • R(e);N_PINQ(E)::QAR2(E)
      • R(e);N_PINQ(E)::QAR2(E),XR(e)
      • B(a);N_PINQ(E)::QAB1(E)
      • S(f);N_PINQ(E)::QAB(E)
      • P(i);::S(C),XP(i)
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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).