MESON Chess Problem Database

Problem Display
PID: 236487 (1K6/5pQp/p7/1R2p2q/p2k1p2/1PN3b1/n1P1R3/4B2b w - - 0 1)

Forster, Klaus

Variantim, 2018

1K6/5pQp/p7/1R2p2q/p2k1p2/1PN3b1/n1P1R3/4B2b

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Qxe5#
    • 1...Qg4
      • 2.Qxe5#
    • 1...Qg6
      • 2.Qxe5#
    • 1...Qh2
      • 2.Qxe5#
    • 1...Qh3
      • 2.Qxe5#
    • 1...Qh4
      • 2.Qxe5#
    • 1...Qh6
      • 2.Qxe5#
    • 1...Be4
      • 2.Rxe4#
    • 1...Bd5
      • 2.Rxd5#
    • 1...f3
      • 2.Re4#
      • 2.Rd5#
    • 1...f5
      • 2.Qxe5#
      • 2.Qa7#
    • 1...f6
      • 2.Qa7#
  • Tries
    • 1.Rd2+?
      • 1...Ke3
        • 2.Rd3#
      • 1...Kxc3!
    • 1.Rbxe5?
      • threat
        • 2.Rd5#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Qxe2
        • 2.Sxe2#
      • 1...Sxc3
        • 2.Rd2#
      • 1...Bd5
        • 2.Rxd5#
      • 1...f3
        • 2.Re4#
      • 1...f6
        • 2.Qa7#
      • 1...axb3!
  • Keys
    • 1.Rexe5!
      • threat
        • 2.Re4#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Sxc3
        • 2.Rb4#
      • 1...axb5
        • 2.Sxb5#
      • 1...Be4
        • 2.Rxe4#
      • 1...f3
        • 2.Rd5#
      • 1...f6
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(h);N_GUARD::QAB1(G),XP(g)
    • B(a);N_GUARD::R1(C),XB(a)
    • B(a);N_GUARD::R1(F),XB(a)
    • P(j);N_SPINP(g),OGATE::QAB(G)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(e);N_SPINP(g),S_FLIGHT::R1(C)
      • Refutation
        • K(e);S_FLIGHT,XS(E)
    • Try
      • R(F);XP(g)
      • Threat
        • QAB(G)+R(F),DCHECK
      • Vars
        • Q(h);CHECK,OGATE,P_SPINQ(h),XR(F)::QAB1(G),XQ(h)
        • Q(h);XR(C)::S(E),XQ(h)
        • S(b);SBLOCK,XS(E)::R(C)
        • B(a);::QAB(G)+R(F),DCHECK,XB(a)
        • P(f);P_PINR(F),S_CUTB(a)::R1(C)
        • P(j);OGATE::QAB(G)
      • Refutation
        • P(d);XP(D)
  • Actual
    • R(C);XP(g)
    • Threat
      • QAB(G)+R(C),DCHECK
    • Vars
      • Q(h);CHECK,OGATE,P_SPINQ(h),XR(C)::QAB1(G),XQ(h)
      • S(b);N_GUARD,XS(E)::R(F)
      • P(i);XR(F)::S(E),XP(i)
      • B(a);::QAB(G)+R(C),DCHECK,XB(a)
      • P(f);P_PINR(C),S_CUTB(a)::R1(F)
      • P(j);OGATE::QAB(G)
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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).