MESON Chess Problem Database

Problem Display
PID: 275169 (8/4QNbb/7r/p1Np4/KP1k3p/2pP4/3RB3/n1B5 w - - 0 1)

Nutt, John

The Problemist, 1934

8/4QNbb/7r/p1Np4/KP1k3p/2pP4/3RB3/n1B5

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Bf8
      • 2.Qe5#
    • 1...Sc2
      • 2.Sb3#
    • 1...Sb3
      • 2.Sxb3#
    • 1...cxd2
      • 2.Bb2#
    • 1...c2
      • 2.Bb2#
  • Tries
    • 1.Se6+?
      • 1...Rxe6
        • 2.Qc5#
      • 1...Ke3!
    • 1.Rd1?
      • threat
        • 2.Be3#
        • 2.Qe3#
      • 1...c2
        • 2.Bb2#
      • 1...Re6
        • 2.Sxe6#
      • 1...Be5
        • 2.Qxe5#
      • 1...Be4
        • 2.dxe4#
      • 1...Sc2
        • 2.Sb3#
      • 1...Bxd3!
    • 1.Qxh4+?
      • 1...Ke3
        • 2.Ra2#
        • 2.Rb2#
        • 2.Rc2#
      • 1...Be4
        • 2.Qf2#
      • 1...Rxh4!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qg1#
      • 1...Bxd3
        • 2.Qf4#
      • 1...cxd2
        • 2.Bb2#
      • 1...c2
        • 2.Bb2#
      • 1...Re6
        • 2.Sxe6#
      • 1...Rf6
        • 2.Qe5#
      • 1...Rg6
        • 2.Qf4#
      • 1...Sc2
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(g);S_CUTB(h)::QAB1(H)
    • B(h);N_GUARD::QAB1(H),XB(h)
    • B(h);N_GUARD::QAB1(H)
    • S(a);N_GUARD::S(G)
    • S(a);N_GUARD::S(G),XS(a)
    • P(b);OGATEB,XR(B)::B(A)
    • P(b);OGATEB::B(A)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • R(g);XS(G)::QAB1(H)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);OGATEB::B(A)
        • R(g);N_GUARD::S(G),XR(g)
        • B(h);N_GUARD::QAB1(H),XB(h)
        • B(i);OGATE::R(B)+P(D),XB(i)
        • S(a);N_GUARD::S(G)
      • Refutation
        • B(i);P_SPINB(i),XP(D)
    • Try
      • Q(H);CHECK,XP(d)
      • Vars
        • B(i);P_SPINB(i)::QAB(H)
      • Refutation
        • R(g);XQ(H)
  • Actual
    • Q(H);
    • Threat
      • QAB(H)
    • Vars
      • B(i);N_GUARD,P_SPINB(i),XP(D)::QAR2(H)
      • P(b);OGATEB,XR(B)::B(A)
      • P(b);OGATEB::B(A)
      • R(g);N_GUARD::S(G),XR(g)
      • R(g);S_CUTB(h)::QAB1(H)
      • R(g);S_CUTB(i)::QAR2(H)
      • S(a);N_GUARD::S(G)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).