Problem Display
PID: 72014 (Q6R/4pN2/4p1p1/2PP2B1/1K1kb3/3N1p2/2P5/6R1 w - - 0 1)

Erokhin, Vladimir Alekseevich

3rd Prize, Hlas l'udu, 1983

Q6R/4pN2/4p1p1/2PP2B1/1K1kb3/3N1p2/2P5/6R1

#2

10 + 6


SOLUTION


  • SOUND
  • Sets
    • 1...exd5
      • 2.Qa1#
  • Tries
    • 1.Rd1?
      • threat
        • 2.c3#
      • 1...Bxd3
        • 2.Rh4#
      • 1...Bxd5
        • 2.Sf2#
      • 1...Bf5!
    • 1.Re1?
      • threat
        • 2.Be3#
      • 1...Bxd3
        • 2.c3#
      • 1...Bxd5
        • 2.Qa1#
      • 1...Bf5!
    • 1.Qa6?
      • threat
        • 2.Qc4#
      • 1...Kxd5
        • 2.Rd8#
      • 1...Bxd3
        • 2.Qxd3#
      • 1...exd5
        • 2.Qa1#
        • 2.c3#
      • 1...Bxd5!
    • 1.Qb8?
      • threat
        • 2.Qe5#
      • 1...e5
        • 2.Qxe5#
      • 1...Kxd5!
  • Keys
    • 1.Rd8!
      • threat
        • 2.Qa1#
      • 1...Bxd3
        • 2.dxe6#
      • 1...Bxd5
        • 2.Rg4#
      • 1...Bf5
        • 2.dxe6#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(d);SBLOCK,XP(F)::QAB(I)
  • Tries
    • Try
      • R(A);
      • Threat
        • P(B)
      • Vars
        • B(c);OGATEB,P_SPINB(c),XS(C)::R(J)
        • B(c);N_GUARD,XP(F)::R(A)+S(C)
      • Refutation
        • B(c);
    • Try
      • R(A);
      • Threat
        • B(G)
      • Vars
        • B(c);SBLOCK,XS(C)::P(B)
        • B(c);SBLOCK,XP(F)::QAB(I)
      • Refutation
        • B(c);
    • Try
      • Q(I);
      • Threat
        • QAR1(I)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(F)::R(J)
        • B(c);OGATE,XS(C)::QAR1(I),XB(c)
      • Refutation
        • B(c);XP(F)
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • P(d);::QAB1(I),XP(d)
      • Refutation
        • K(b);P-FLIGHT,XP(F)
  • Actual
    • R(J);
    • Threat
      • QAB(I)
    • Vars
      • B(c);N_GUARD,XS(C)::R(J)+P(F),XP(d)
      • B(c);OGATEB,P_SPINB(c),XP(F)::R(A)
      • B(c);N_GUARD::R(J)+P(F),XP(d)


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).