MESON Chess Problem Database

Problem Display
PID: 58762 (b4K2/1B1p4/2n3p1/pNRrp3/Rb2kB2/3pNpP1/8/7Q w - - 0 1)

Roura, Juan R

1st Prize, Brisbane Courier, 1920-1921

b4K2/1B1p4/2n3p1/pNRrp3/Rb2kB2/3pNpP1/8/7Q

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Rxe5#
    • 1...Sd4
      • 2.Sd6#
    • 1...Se7
      • 2.Rc4#
    • 1...g5
      • 2.Qh7#
  • Tries
    • 1.Sd6+?
      • 1...Kd4
        • 2.Rc4#
      • 1...Rxd6!
    • 1.Rxb4+?
      • 1...Rd4
        • 2.Sc3#
        • 2.Sd6#
        • 2.Rxe5#
      • 1...Sxb4
        • 2.Rc4#
      • 1...Sd4
        • 2.Sc3#
        • 2.Sd6#
      • 1...axb4!
    • 1.Qh4?
      • threat
        • 2.Bg5#
        • 2.Bh6#
      • 1...exf4
        • 2.Qxf4#
      • 1...f2
        • 2.Qh1#
      • 1...g5
        • 2.Bxg5#
        • 2.Qh7#
      • 1...d2!
    • 1.Qh7?
      • threat
        • 2.Qxg6#
      • 1...f2
        • 2.Qh1#
      • 1...Rd6
        • 2.Rxe5#
      • 1...Sd4
        • 2.Sd6#
      • 1...Se7
        • 2.Rc4#
      • 1...exf4!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qxg6#
      • 1...exf4
        • 2.Qxf4#
      • 1...f2
        • 2.Qh1#
      • 1...Rd6
        • 2.Rxe5#
      • 1...Sd4
        • 2.Sd6#
      • 1...Se7
        • 2.Rc4#
      • 1...g5
        • 2.Qg6#
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(f);N_PINR(G),P_SPINS(h)::R1(G),XP(g)
    • S(h);N_SPINB(c),P_SPINR(f),SBLOCK::S(F)
    • S(h);N_PINR(G),P_SPINR(f)::R(G)
    • P(i);OGATEB::QAB(A)
  • Tries
    • Try
      • S(F);CHECK,N_SPINR(G)
      • Vars
        • K(d);N_SPINP(b),P-FLIGHT::R1(G)
      • Refutation
        • R(f);P_SPINS(h),XS(F)
    • Try
      • R(D);CHECK,N_SPINR(G),XB(c)
      • Vars
        • S(h);N_GUARD,P_SPINR(f),XR(D)::R(G)
      • Refutation
        • P(e);XR(D)
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • P(g);OGATE,P_SPINP(g),XB(E)::QAR1(A),XP(g)
        • P(b);OGATEB::QAB(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);N_PINP(b),P_PINP(i)
      • Threat
        • QAB(A),XP(i)
      • Vars
        • P(b);OGATEB::QAB(A)
        • R(f);N_PINR(G),P_SPINS(h)::R1(G),XP(g)
        • S(h);N_SPINB(c),P_SPINR(f),SBLOCK::S(F)
        • S(h);N_PINR(G),P_SPINR(f)::R(G)
      • Refutation
        • P(g);XB(E)
  • Actual
    • Q(A);N_PINP(b)
    • Threat
      • QAB(A),XP(i)
    • Vars
      • P(g);OGATE,XB(E)::QAR1(A),XP(g)
      • P(b);OGATEB::QAB(A)
      • R(f);N_PINR(G),P_SPINS(h)::R1(G),XP(g)
      • S(h);N_SPINB(c),P_SPINR(f),SBLOCK::S(F)
      • S(h);N_PINR(G),P_SPINR(f)::R(G)
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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).