Problem Display
PID: 142548 (2Q5/3p1r2/5R2/4p3/2BN1r2/1p2k1P1/3R1N2/3K4 w - - 0 1)

Popov, Valery

1st Prize, Birnov MT, 2006

2Q5/3p1r2/5R2/4p3/2BN1r2/1p2k1P1/3R1N2/3K4

#2

8 + 6


23 Die Schwalbe 2011

SOLUTION


  • SOUND
  • Sets
    • 1...Re4
      • 2.Rd3#
    • 1...Rg4
      • 2.Rd3#
    • 1...Rh4
      • 2.Rd3#
  • Tries
    • 1.Ke1?
      • threat
        • 2.Rd3#
      • 1...Rxd4
        • 2.Re2#
      • 1...e4
        • 2.Sd1#
      • 1...Rxf2!
    • 1.Bd5?
      • threat
        • 2.Qc3#
      • 1...exd4
        • 2.Re2#
      • 1...Rxd4!
    • 1.Qc5?
      • threat
        • 2.Re2#
      • 1...Rxf2
        • 2.Qxe5#
      • 1...Rxd4
        • 2.Rd3#
      • 1...exd4!
    • 1.Qb8?
      • threat
        • 2.Qxb3#
      • 1...Rxf2
        • 2.Qxe5#
      • 1...exd4
        • 2.Qxf4#
      • 1...b2
        • 2.Qb3#
      • 1...Rxd4!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxb3#
      • 1...Rxf2
        • 2.Rd3#
      • 1...Rxd4
        • 2.Qf3#
      • 1...exd4
        • 2.Re2#
      • 1...b2
        • 2.Sc2#
        • 2.Qb3#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(c);::R1(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • R1(B)
      • Vars
        • R(c);SBLOCK,XS(F)::R1(B)
        • P(d);SBLOCK::S(C)
      • Refutation
        • R(c);XS(C)
    • Try
      • B(E);
      • Threat
        • QAR2(H)
      • Vars
        • P(d);SBLOCK,XS(F)::R1(B)
      • Refutation
        • R(c);P_PINR(B),XS(F)
    • Try
      • Q(H);
      • Threat
        • R1(B)
      • Vars
        • R(c);N_GUARD,XS(C)::QAR2(H),XP(d)
        • R(c);P_PINR(B),P_SPINR(c),XS(F)::R1(B)
      • Refutation
        • P(d);P_SPINP(d),XS(F)
    • Try
      • Q(H);
      • Threat
        • QAR(H),XP(a)
      • Vars
        • R(c);N_GUARD,XS(C)::QAR2(H),XP(d)
        • P(d);OGATE,XS(F)::QAB1(H),XR(c)
        • P(a);::QAR(H)
      • Refutation
        • R(c);P_PINR(B),XS(F)
  • Actual
    • Q(H);
    • Threat
      • QAR(H),XP(a)
    • Vars
      • R(c);XS(C)::R1(B)
      • R(c);N_GUARD,P_PINR(B),XS(F)::QAR1(H)
      • P(d);SBLOCK,XS(F)::R1(B)


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).