MESON Chess Problem Database

Problem Display
PID: 178021 (4R3/1Q1r3p/2q2P1K/4N3/1n2kPP1/2P1NR1p/4pB2/2b3nB w - - 0 1)

den Toom, Bas

Probleemblad, 1979

4R3/1Q1r3p/2q2P1K/4N3/1n2kPP1/2P1NR1p/4pB2/2b3nB

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Qxh7#
    • 1...Rd2
      • 2.Qxh7#
    • 1...Rd3
      • 2.S5c4#
      • 2.Sxc6#
      • 2.Sg6#
      • 2.Sd7#
      • 2.Sf7#
      • 2.Qxh7#
    • 1...Rd4
      • 2.Qxh7#
    • 1...Rd5
      • 2.Qxh7#
    • 1...Rd6
      • 2.Qxh7#
    • 1...Rd8
      • 2.Qxh7#
    • 1...Sd5
      • 2.Qb1#
  • Tries
    • 1.Sd3+?
      • 1...Re7
        • 2.Sc5#
      • 1...Kxd3!
    • 1.Sxc6+?
      • 1...Re7
        • 2.Sxb4#
      • 1...Kd3!
    • 1.Qxb4+?
      • 1...Rd4
        • 2.Qxd4#
      • 1...Qc4!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Re3#
      • 1...Qxf6+
        • 2.Sxf6#
      • 1...Bxf4+
        • 2.Rxf4#
      • 1...Kxd5
        • 2.Rd3#
      • 1...Qxd5
        • 2.Sxd7#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...Rxd5
        • 2.Qxh7#
      • 1...Sxf3
        • 2.Bxf3#
      • 1...Sxd5
        • 2.Qb1#
      • 1...Be3
        • 2.Rxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 5
  • Sets
    • R(h);OGATE::QAB(K),XP(i)
    • R(h);N_SPINQ(g),OGATE::QAB(K),XP(i)
    • S(e);N_SPINQ(g),OGATE::QAB(K)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • R(h);P_SPINR(h)::S(H)
      • Refutation
        • K(f);N_SPINQ(g),S_FLIGHT,XS(H)
    • Try
      • S(H);CHECK,N_SPINP(I),XQ(g)
      • Vars
        • R(h);P_SPINR(h)::QAB(K)+S(H),XS(e)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(K);CHECK,N_PINQ(g),XS(e)
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAR1(K),XR(h)
      • Refutation
        • Q(g);N_PINP(I),P_SPINQ(g)
  • Actual
    • S(D);N_PINQ(g),N_SPINP(I),P_SPINP(F)
    • Threat
      • B(A)+R(E),DCHECK
    • Vars
      • Q(g);CHECK,XP(I)::QAB(K)+S(D),DCHECK,XQ(g)
      • B(a);CHECK,OGATE,P_PINP(I),XP(F)::B(A)+R(E),DCHECK,XB(a)
      • K(f);P_SPINQ(g),S_FLIGHT,XS(D)::B(A)+R(E),DCHECK
      • Q(g);N_GUARD,P_SPINQ(g),XS(D)::R(L)+S(H),XR(h)
      • Q(g);XP(C)::QAB(K)+S(D),DCHECK,XQ(g)
      • R(h);OGATE,SBLOCK,XS(D)::QAB(K),XP(i)
      • S(b);OGATE,P_SPINS(b),XR(E)::B(A),XS(b)
      • S(e);OGATE,SBLOCK,XS(D)::QAB(K)
      • B(a);::B(A)+R(E),DCHECK,XB(a)
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).