MESON Chess Problem Database

Problem Display
PID: 225583 (1B1R4/P1Q2p2/2p2P2/1b1n1p2/1r1k1N1R/bP2p3/Pp2p3/1B2K3 w - - 0 1)

Lazdinits, Eriks

Praca, 1958

1B1R4/P1Q2p2/2p2P2/1b1n1p2/1r1k1N1R/bP2p3/Pp2p3/1B2K3

#2

11 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Sxd5#
    • 1...Kc5
      • 2.Rxd5#
    • 1...c5
      • 2.Sxe2#
      • 2.Qe5#
  • Tries
    • 1.Sd3+?
      • 1...f4
        • 2.Qe5#
      • 1...Kc3!
    • 1.Sxd5+?
      • 1...Kc5
        • 2.Qb6#
        • 2.Qd6#
        • 2.Qe7#
      • 1...f4!
    • 1.Rxd5+?
      • 1...cxd5
        • 2.Sxe2#
        • 2.Se6#
      • 1...Kc3!
    • 1.Qb6+?
      • 1...c5
        • 2.Sxe2#
      • 1...Kc3!
    • 1.Qxc6?
      • threat
        • 2.Sxe2#
        • 2.Se6#
        • 2.Rxd5#
      • 1...Rc4
        • 2.Sxe2#
      • 1...Bd3
        • 2.Sxe2#
        • 2.Se6#
      • 1...Bc4
        • 2.Sxe2#
      • 1...Bxc6!
    • 1.Qe7?
      • threat
        • 2.Sxe2#
        • 2.Be5#
      • 1...Rxb3
        • 2.Sxe2#
      • 1...Bd3
        • 2.Sxe2#
      • 1...Kc3!
  • Keys
    • 1.Qa5!
      • 1...Kc3
        • 2.Be5#
      • 1...Kc5
        • 2.Sd3#
      • 1...Rxb3
        • 2.Se6#
      • 1...Ra4
        • 2.Se6#
      • 1...Rc4
        • 2.Se6#
      • 1...Bd3
        • 2.Sxe2#
      • 1...Ba4
        • 2.Sxe2#
      • 1...Bc4
        • 2.Sxe2#
      • 1...Ba6
        • 2.Sxe2#
      • 1...c5
        • 2.Sxe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINS(h),P_SPINP(j),S_FLIGHT::S(E),XS(h)
    • K(f);N_SPINS(h),P_SPINP(j),S_FLIGHT::R1(K),XS(h)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • P(i);P_SPINP(i)::QAB1(I)
      • Refutation
        • K(f);N_SPINS(h),P_SPINP(j),S_FLIGHT
    • Try
      • S(E);CHECK,XS(h)
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • R(K);CHECK,XS(h)
      • Refutation
        • K(f);P_SPINP(j),S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • P(j);P_SPINP(j)::R(F)+S(E),DCHECK,XP(b)
      • Refutation
        • K(f);N_SPINS(h),S_FLIGHT
    • Try
      • Q(I);XP(j)
      • Threat
        • DUALS(3)
      • Vars
        • R(e);::R(F)+S(E),DCHECK,XP(b)
        • B(g);::R(F)+S(E),DCHECK,XP(b)
      • Refutation
        • B(g);XQ(I)
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XP(D)::R(F)+S(E),DCHECK,XP(b)
        • B(g);::R(F)+S(E),DCHECK,XP(b)
      • Refutation
        • K(f);N_SPINS(h),S_FLIGHT
  • Actual
    • Q(I);
    • Vars
      • K(f);N_SPINS(h),P_SPINR(e),S_FLIGHT::B(J)
      • K(f);N_SPINS(h),P_SPINB(g),S_FLIGHT::S(E)
      • R(e);XP(D)::R(F)+S(E),DCHECK
      • R(e);::R(F)+S(E),DCHECK
      • B(g);::R(F)+S(E),DCHECK,XP(b)
      • P(j);SBLOCK::R(F)+S(E),DCHECK,XP(b)
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).