MESON Chess Problem Database

Problem Display
PID: 75481 (b4bB1/K2N1n1r/1R2n2q/2p1pr2/PNk1p3/1R6/P7/B6Q w - - 0 1)

Sydenham, Colin Peter

Comm., Mat Plus, 2007

b4bB1/K2N1n1r/1R2n2q/2p1pr2/PNk1p3/1R6/P7/B6Q

#2

10 + 11

56 The Problemist 2009
56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Qxc1#
    • 1...Qg7
      • 2.Qc1#
    • 1...Qh4
      • 2.Qc1#
    • 1...Qh5
      • 2.Qc1#
    • 1...Qf6
      • 2.Qc1#
    • 1...Qg6
      • 2.Qc1#
    • 1...Rf1
      • 2.Qxf1#
    • 1...Rf4
      • 2.Qc1#
    • 1...Rg5
      • 2.Qc1#
      • 2.Qf1#
    • 1...Rh5
      • 2.Qf1#
    • 1...Sd4
      • 2.Rc3#
    • 1...Sf4
      • 2.Qc1#
    • 1...Seg5
      • 2.Qc1#
    • 1...Sfg5
      • 2.Qc1#
    • 1...e3
      • 2.Qc1#
  • Tries
    • 1.Sxe5+?
      • 1...Rxe5
        • 2.Qf1#
      • 1...Sxe5+!
    • 1.Rb7?
      • threat
        • 2.Sb6#
      • 1...Sd4
        • 2.Rc3#
      • 1...Sf4
        • 2.Qxe4#
        • 2.Qc1#
      • 1...Seg5
        • 2.Qc1#
      • 1...Sc7
        • 2.Qxe4#
      • 1...Sg7
        • 2.Qxe4#
      • 1...Sed8
        • 2.Qxe4#
      • 1...cxb4!
    • 1.Qxe4+?
      • 1...Sd4
        • 2.Rc3#
        • 2.Qd3#
      • 1...Bxe4!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Sb6#
      • 1...Sfg5
        • 2.Qc1#
      • 1...Sd6
        • 2.Rxc5#
      • 1...Sfd8
        • 2.Qxe4#
      • 1...Sh8
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(g);N_GUARD::QAR(B),XQ(g)
    • Q(g);N_GUARD::QAR(B)
    • R(e);N_GUARD::QAB(B),XR(e)
    • R(e);S_CUTQ(g)::QAR(B)
    • R(e);N_GUARD::QAB(B)
    • S(f);P_SPINS(h),SBLOCK::R1(D)
    • S(f);P_SPINS(h),S_CUTQ(g)::QAR(B)
    • S(h);P_PINS(I),P_SPINS(f),S_CUTQ(g)::QAR(B)
    • P(b);S_CUTQ(g)::QAR(B)
  • Tries
    • Try
      • S(I);CHECK,XP(d)
      • Vars
        • R(e);XS(I)::QAB(B)
      • Refutation
        • S(h);CHECK,P_SPINS(f),XS(I)
    • Try
      • R(G);
      • Threat
        • S(I)
      • Vars
        • S(f);P_SPINS(h),SBLOCK::R1(D)
        • S(f);P_SPINS(h),S_CUTQ(g)::QAR(B)
        • S(f);N_GUARD,P_SPINS(h)::QAR2(B),XP(b)
      • Refutation
        • P(c);XS(F)
    • Try
      • Q(B);CHECK,XP(b)
      • Refutation
        • B(j);XQ(B)
  • Actual
    • R(G);P_PINP(c)
    • Threat
      • S(I)
    • Vars
      • S(h);P_PINS(I),P_SPINS(f),S_CUTQ(g)::QAR(B)
      • S(h);P_PINS(I),P_SPINS(f),S_CUTB(k)::R1(G),XP(c)
      • S(h);P_PINS(I),P_SPINS(f)::QAR2(B),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).