MESON Chess Problem Database

Problem Display
PID: 43040 (1b3Rr1/2B2N1p/3qP2p/p1Q5/Rn3kp1/K3p3/2N1P2P/5n1B w - - 0 1)

Fenner, A Jack

Vaughan, Colin V

The Problemist, 1965

1b3Rr1/2B2N1p/3qP2p/p1Q5/Rn3kp1/K3p3/2N1P2P/5n1B

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Qxe5#
    • 1...Rg5
      • 2.Sxg5#
    • 1...Rh8
      • 2.Sxh8#
    • 1...Ba7
      • 2.Bxd6#
  • Tries
    • 1.Sxb4?
      • threat
        • 2.Sa2#
        • 2.Sc2#
        • 2.Sd3#
        • 2.Sa6#
        • 2.Sc6#
      • 1...axb4+
        • 2.Rxb4#
      • 1...Bxc7
        • 2.Sd3#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Sd2
        • 2.Sd3#
      • 1...Sg3
        • 2.Sd3#
      • 1...Sxh2!
    • 1.Sd4?
      • threat
        • 2.Qxd6#
        • 2.Qf5#
      • 1...Sc2+
        • 2.Sxc2#
      • 1...Qxc7
        • 2.Qf5#
      • 1...Bxc7
        • 2.Qf5#
      • 1...Sxh2
        • 2.Qxd6#
      • 1...g3
        • 2.Qf5#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Rg5
        • 2.Sxg5#
      • 1...Sg3
        • 2.Qxd6#
      • 1...Sa2
        • 2.Qxd6#
      • 1...Sd5
        • 2.Qxd6#
      • 1...Sa6
        • 2.Qxd6#
      • 1...Sc6
        • 2.Sxc6#
      • 1...Sd3!
    • 1.Se5+?
      • 1...Qxf8
        • 2.Sd3#
        • 2.Sg6#
      • 1...Rxf8
        • 2.Sd3#
      • 1...Kg5!
  • Keys
    • 1.Be4!
      • threat
        • 2.Qf5#
      • 1...Sxc2+
        • 2.Bxc2#
      • 1...Kxe4
        • 2.Sxd6#
      • 1...Sxh2
        • 2.Qxe3#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Rg5
        • 2.Sxg5#
      • 1...Sg3
        • 2.Qxe3#
      • 1...Sa2
        • 2.Qxd6#
      • 1...Sd3
        • 2.Bxd3#
      • 1...Sd5
        • 2.Qxd6#
      • 1...Sa6
        • 2.Qxd6#
      • 1...Sc6
        • 2.Bxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 2
  • Sets
    • Q(g);N_GUARD::QAB1(G),XQ(g)
    • R(k);N_GUARD::R(K)+S(J),XR(k)
    • B(j);N_GUARD::B(I),XQ(g)
  • Tries
    • Try
      • S(B);XS(c)
      • Threat
        • DUALS(5)
      • Vars
        • P(f);CHECK,OGATE,P_SPINP(f),XS(B)::R(F),XP(f)
        • B(j);N_SPINQ(g),XB(I)::R(F)+S(B),DCHECK
        • Q(g);N_GUARD::QAB1(G),XQ(g)
        • S(a);::R(F)+S(B),DCHECK
      • Refutation
        • S(a);XP(D)
    • Try
      • S(B);N_PINS(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);CHECK,P_PINQ(G)::R(F)+S(B),XS(c)
        • Q(g);N_SPINQ(g),XB(I)::QAR1(G)
        • B(j);N_SPINQ(g),XB(I)::QAR1(G)
        • S(a);XP(D)::QAB(G),XQ(g)
        • P(e);::QAR1(G)
        • Q(g);N_GUARD::QAB1(G),XQ(g)
        • R(k);N_GUARD::R(K)+S(J),XR(k)
        • S(a);::QAB(G),XQ(g)
        • S(c);P_PINQ(G)::QAB(G),XQ(g)
        • S(c);P_PINQ(G)::R(F)+S(B),XS(c)
      • Refutation
        • S(c);P_PINQ(G)
    • Try
      • S(J);CHECK,N_PINQ(g)
      • Vars
        • R(k);XR(K)::S(J)
      • Refutation
        • K(d);N_SPINS(c),S_FLIGHT
  • Actual
    • B(A);N_PINS(c)
    • Threat
      • QAR1(G)
    • Vars
      • S(c);CHECK,OGATE,P_PINQ(G),XS(B)::R(F)+B(A),XS(c)
      • K(d);N_SPINQ(g),P-FLIGHT,P_SPINS(c),XB(A)::S(J),XQ(g)
      • S(a);N_GUARD,XP(D)::QAB1(G),XP(b)
      • Q(g);N_GUARD::QAB1(G),XQ(g)
      • R(k);N_GUARD::R(K)+S(J),XR(k)
      • S(a);N_GUARD::QAB1(G),XP(b)
      • S(c);P_PINQ(G)::QAB(G),XQ(g)
      • S(c);OGATEB,P_PINQ(G)::R(F)+B(A),XS(c)
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).