MESON Chess Problem Database

Problem Display
PID: 180257 (N7/3K3B/1N6/RpkP4/5P2/p7/prP1p3/Q1R1B3 w - - 0 1)

Lider, Valentin Viktorovich

Schach, 1983

N7/3K3B/1N6/RpkP4/5P2/p7/prP1p3/Q1R1B3

#2

11 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Qc3#
    • 1...Rxc2
      • 2.Rxc2#
    • 1...Rb3
      • 2.cxb3#
  • Tries
    • 1.Qxb2?
      • threat
        • 2.Bf2#
        • 2.Bb4#
        • 2.Rxb5#
        • 2.Qc3#
        • 2.Qb4#
      • 1...a1Q
        • 2.Bf2#
        • 2.Bb4#
        • 2.Rxb5#
        • 2.Qb4#
      • 1...a1B
        • 2.Bf2#
        • 2.Bb4#
        • 2.Rxb5#
        • 2.Qb4#
      • 1...axb2!
    • 1.c3?
      • threat
        • 2.Bf2#
      • 1...Rb4
        • 2.cxb4#
      • 1...Rd2!
    • 1.d6?
      • 1...Rxc2
        • 2.Rxc2#
        • 2.Qe5#
      • 1...Rb4
        • 2.Qe5#
      • 1...Rb1
        • 2.Qc3#
        • 2.Qe5#
      • 1...Rb3
        • 2.Qe5#
        • 2.cxb3#
      • 1...Kd4!
  • Keys
    • 1.c4!
      • 1...Kd4
        • 2.Bf2#
      • 1...Rb4
        • 2.Bf2#
      • 1...Rb1
        • 2.Sa4#
      • 1...Rc2
        • 2.Rxb5#
      • 1...Rd2
        • 2.Rxb5#
      • 1...Rb3
        • 2.Sa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATE::QAR2(A)
    • R(b);OGATE,P_SPINR(b),XP(D)::R(B),XR(b)
    • R(b);OGATE::R(B)+P(D),XR(b)
  • Tries
    • Try
      • Q(A);XR(b)
      • Threat
        • DUALS(5)
      • Refutation
        • P(d);XQ(A)
    • Try
      • P(D);
      • Threat
        • B(C)
      • Vars
        • R(b);OGATE::R(B)+P(D)DCHECK,XR(b)
      • Refutation
        • R(b);P_PINP(G)
    • Try
      • P(G);
      • Vars
        • R(b);OGATE::QAR2(A)
      • Refutation
        • K(f);N_SPINP(e),P_SPINR(b),S_FLIGHT
  • Actual
    • P(D);
    • Vars
      • K(f);N_SPINP(e),P_SPINR(b),S_FLIGHT::B(C)
      • R(b);SBLOCK::B(C)
      • R(b);::S(H)
      • R(b);N_GUARD::R1(F),XP(e)
      • R(b);N_GUARD,P_PINP(G)::R1(F),XP(e)
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).