MESON Chess Problem Database

Problem Display
PID: 122147 (6K1/2p2p2/Q7/pP3R2/3PkbB1/r2p2P1/1N1nPB2/1nq5 w - - 0 1)

Knieling, N

Caissa, 1980

6K1/2p2p2/Q7/pP3R2/3PkbB1/r2p2P1/1N1nPB2/1nq5

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2
      • 2.Qc6#
    • 1...Qd1
      • 2.Qc6#
    • 1...Qe1
      • 2.Qc6#
    • 1...Qf1
      • 2.Qc6#
    • 1...Qg1
      • 2.Qc6#
    • 1...Qh1
      • 2.Qc6#
    • 1...Qc6
      • 2.Qxc6#
    • 1...Ra1
      • 2.exd3#
    • 1...Ra2
      • 2.exd3#
    • 1...Ra4
      • 2.exd3#
    • 1...Be5
      • 2.Rxe5#
    • 1...Bg5
      • 2.Re5#
    • 1...Bh6
      • 2.Re5#
    • 1...Sc3
      • 2.exd3#
    • 1...Sb3
      • 2.exd3#
    • 1...Sf3
      • 2.exf3#
    • 1...Sc4
      • 2.Qc6#
    • 1...c5
      • 2.Qb7#
      • 2.Qc6#
      • 2.Qa8#
  • Tries
    • 1.Qb7+?
      • 1...Qc6
        • 2.Qxc6#
      • 1...c6!
    • 1.Qe6+?
      • 1...Be5
        • 2.Rf4#
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...fxe6!
    • 1.Qa8+?
      • 1...Qc6
        • 2.Qxc6#
      • 1...c6!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qxf4#
      • 1...Bxg3
        • 2.Qe3#
      • 1...Bxh6
        • 2.Re5#
      • 1...Be3
        • 2.Qxe3#
      • 1...Be5
        • 2.Rxe5#
      • 1...Bg5
        • 2.Re5#
      • 1...Bd6
        • 2.Qe3#
      • 1...Sf1
        • 2.Qh1#
      • 1...Sb3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...Sc4
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 11
  • Sets
    • Q(b);N_GUARD,XS(A)::QAB(I)
    • Q(b);N_GUARD::QAB(I)
    • Q(b);N_GUARD::QAB(I),XQ(b)
    • R(d);N_GUARD::P(B),XP(e)
    • B(g);N_GUARD::R1(H),XB(g)
    • B(g);N_GUARD::R1(H)
    • S(a);S_CUTR(d)::P(B),XP(e)
    • S(c);S_CUTR(d)::P(B),XP(e)
    • S(c);OGATE::P(B),XS(c)
    • S(c);S_CUTQ(b)::QAB(I)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB(I),XQ(b)
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • Q(I);CHECK
      • Refutation
        • P(j);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB(I),XQ(b)
      • Refutation
        • P(i);P_SPINP(i)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I),XB(g)
    • Vars
      • B(g);OGATE,XP(D)::QAR1(I)
      • B(g);N_GUARD,XQ(I)::R1(H)
      • B(g);OGATE::QAR1(I),XB(g)
      • B(g);N_GUARD::R1(H),XB(g)
      • B(g);N_GUARD::R1(H)
      • B(g);OGATE::QAR1(I)
      • S(c);N_GUARD,S_CUTQ(b)::QAB(I)
      • S(c);S_CUTR(d)::P(B),XP(e)
      • S(c);OGATE::P(B),XS(c)
      • S(c);S_CUTQ(b)::QAB(I)
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).