MESON Chess Problem Database

Problem Display
PID: 201497 (B1R1R3/4B3/r1n3p1/r2pN1K1/q1p1kN2/PpP1Pp2/1P6/4Q3 w - - 0 1)

Rivera, Luis G

L'Alfiere di Re, 1922

B1R1R3/4B3/r1n3p1/r2pN1K1/q1p1kN2/PpP1Pp2/1P6/4Q3

#2

12 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.exd4#
    • 1...d4
      • 2.exd4#
  • Tries
    • 1.Bc5?
      • threat
        • 2.Sxc6#
        • 2.Qb1#
      • 1...Rxc5
        • 2.Sxc6#
      • 1...Sxe5
        • 2.Bxd5#
        • 2.Qb1#
      • 1...Ra7
        • 2.Qb1#
      • 1...Sb4
        • 2.Sc6#
      • 1...Sd4
        • 2.Bxd5#
        • 2.exd4#
      • 1...Sa7
        • 2.Sc6#
        • 2.Bxd5#
        • 2.Qb1#
      • 1...Sb8
        • 2.Sc6#
        • 2.Bxd5#
        • 2.Qb1#
      • 1...Sd8
        • 2.Bxd5#
        • 2.Qb1#
      • 1...f2
        • 2.Qb1#
        • 2.Qh1#
      • 1...d4
        • 2.Sed3#
        • 2.Sxc4#
        • 2.Sg4#
        • 2.Sxc6#
        • 2.Sexg6#
        • 2.Sd7#
        • 2.Sf7#
        • 2.exd4#
      • 1...Se7!
    • 1.Qb1+?
      • 1...Kxe3
        • 2.Qe1#
      • 1...Kxe5!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Qb1#
      • 1...d4+
        • 2.Bc5#
      • 1...f2
        • 2.Qh1#
      • 1...Sb4
        • 2.Rxc4#
      • 1...Sd4
        • 2.exd4#
      • 1...Se5
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(i);OGATE,P_SPINP(g)::QAR(A)+P(E),XS(i)
    • P(g);OGATE,P_PINS(G),P_SPINS(i)::QAR(A)+P(E),XP(g)
  • Tries
    • Try
      • B(I);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XB(I)::R(L)+S(G),XS(i)
        • R(h);::QAB(A)
        • S(i);P_SPINP(g)::R(L)+S(G)
      • Refutation
        • S(i);P_SPINP(g)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
      • Refutation
        • K(e);P-FLIGHT,XS(G)
  • Actual
    • S(G);
    • Threat
      • QAB(A)
    • Vars
      • P(g);CHECK,P_SPINS(i)::R(L)+B(I)
      • P(b);OGATEB::QAB(A)
      • S(i);OGATE,P_SPINP(g)::R(K),XP(d)
      • S(i);OGATE,P_SPINP(g)::QAR(A)+P(E),XS(i)
      • S(i);P_SPINP(g),SBLOCK::S(G)
HTML5 logo

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).