Problem Display
PID: 252583 (8/K2p4/2RP4/1Qpk1P2/n1R1pB2/2p5/2P1N1p1/6bq w - - 0 1)

Ivanov, G

64 Shakhmatnoe obozrenie, 2021

8/K2p4/2RP4/1Qpk1P2/n1R1pB2/2p5/2P1N1p1/6bq

#2

9 + 9


SOLUTION


  • SOUND
  • Sets
    • 1...Bh2
      • 2.Rd4#
    • 1...Bd4
      • 2.Rxd4#
    • 1...Sb2
      • 2.Sxc3#
    • 1...Sb6
      • 2.Sxc3#
    • 1...e3
      • 2.Rd4#
  • Tries
    • 1.Rxe4?
      • threat
        • 2.Re5#
      • 1...Kxe4
        • 2.Qd3#
      • 1...dxc6
        • 2.Qc4#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Qh8!
    • 1.R6xc5+?
      • 1...Sxc5
        • 2.Sxc3#
      • 1...Bxc5+!
    • 1.Qb3?
      • threat
        • 2.R4xc5#
      • 1...Kxc6
        • 2.Qb7#
      • 1...dxc6
        • 2.Rd4#
      • 1...e3!
  • Keys
    • 1.Qb7!
      • threat
        • 2.R6xc5#
      • 1...Kxc4
        • 2.Qb3#
      • 1...dxc6
        • 2.Qf7#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::R1(C)
    • B(a);N_GUARD::R1(C),XB(a)
    • S(e);N_GUARD::S(B),XP(d)
    • P(f);S_CUTB(a)::R1(C)
  • Tries
    • Try
      • R(C);XP(f)
      • Threat
        • R1(C)
      • Vars
        • K(h);N_GUARD,N_SPINP(g),S_CUTB(a),S_FLIGHT,XR(C)::QAB1(E)
        • P(i);SBLOCK,XR(G)::QAB1(E)
        • B(a);N_GUARD::R1(C),XB(a)
      • Refutation
        • Q(b);
    • Try
      • R(G);CHECK,P_SPINR(G),XP(g)
      • Vars
        • S(e);P_SPINS(e),XR(G)::S(B),XP(d)
      • Refutation
        • B(a);CHECK,P_SPINB(a),XR(G)
    • Try
      • Q(E);N_PINP(g)
      • Threat
        • QAB(E)+R(C),DCHECK,XP(g)
      • Vars
        • K(h);OGATEB,P_SPINP(g),S_FLIGHT,XR(G)::QAB1(E)
        • P(i);SBLOCK,XR(G)::QAB(E)+R(C),DCHECK
      • Refutation
        • P(f);
  • Actual
    • Q(E);N_PINP(g)
    • Threat
      • QAB(E)+R(G),DCHECK,XP(g)
    • Vars
      • K(h);OGATEB,P_SPINP(g),S_FLIGHT,XR(C)::QAB1(E)
      • P(i);OGATE,P_SPINP(i),SBLOCK,XR(G)::QAB(E)


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).