MESON Chess Problem Database

Problem Display
PID: 201509 (K2n4/ppB5/5p2/Npk1r2R/1Nbp4/P7/r1qQ4/2R5 w - - 0 1)

Roura, Juan R

L'Alfiere di Re, 1922

K2n4/ppB5/5p2/Npk1r2R/1Nbp4/P7/r1qQ4/2R5

#2

8 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Sxb3#
    • 1...Qe4
      • 2.Sb3#
    • 1...Qf5
      • 2.Sb3#
    • 1...Qg6
      • 2.Sb3#
    • 1...Qh7
      • 2.Sb3#
    • 1...Qxd2
      • 2.Sb3#
    • 1...Bd5
      • 2.Sd3#
    • 1...Sc6
      • 2.Sxb7#
    • 1...Se6
      • 2.Sxb7#
    • 1...Sf7
      • 2.Sxb7#
    • 1...d3
      • 2.Qe3#
  • Tries
    • 1.Rxe5+?
      • 1...Bd5
        • 2.Sd3#
        • 2.Rxd5#
      • 1...fxe5!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qf8#
      • 1...d3
        • 2.Qe3#
      • 1...Qf5
        • 2.Sb3#
      • 1...Qh7
        • 2.Sb3#
      • 1...Bd5
        • 2.Sd3#
      • 1...Sc6
        • 2.Sxb7#
      • 1...Se6
        • 2.Sxb7#
      • 1...Sf7
        • 2.Sxb7#
      • 1...f5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD,P_SPINB(c)::S(E),XQ(b)
    • Q(b);N_GUARD,P_SPINB(c)::S(E)
    • Q(b);N_GUARD,N_SPINR(g),P_SPINB(c)::S(E)
    • Q(b);N_GUARD,P_SPINB(c),XQ(B)::S(E)
    • B(c);N_GUARD,N_SPINR(g),P_SPINQ(b),SBLOCK::S(D)
    • S(k);N_GUARD::S(E),XP(j)
    • P(d);OGATEB::QAB(B)
  • Tries
    • Try
      • R(F);CHECK,XR(g)
      • Refutation
        • P(h);XR(F)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • P(d);OGATEB::QAB(B)
      • Q(b);N_GUARD,N_SPINR(g),P_SPINB(c)::S(E)
      • Q(b);N_GUARD,P_SPINB(c)::S(E)
      • B(c);N_GUARD,N_SPINR(g),P_SPINQ(b),SBLOCK::S(D)
      • S(k);N_GUARD::S(E),XP(j)
      • P(h);N_SPINR(g),OGATE::QAB1(B)
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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).