MESON Chess Problem Database

Problem Display
PID: 215125 (3B3N/3p1r1Q/R2Pk3/P3b3/1KN2r2/P1p1Pp2/BPpR4/3q4 w - - 0 1)

Anonymous

SEPA, 1942

3B3N/3p1r1Q/R2Pk3/P3b3/1KN2r2/P1p1Pp2/BPpR4/3q4

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4+
      • 2.Bxc4#
    • 1...Rd4
      • 2.Qxf7#
    • 1...Re4
      • 2.Qxf7#
    • 1...Rg4
      • 2.Qxf7#
    • 1...Rh4
      • 2.Qxf7#
    • 1...R4f5
      • 2.Sb6#
    • 1...R4f6
      • 2.Sb6#
    • 1...R7f5
      • 2.Qe7#
    • 1...Bxd6+
      • 2.Raxd6#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Sxe5#
        • 2.Sb6#
        • 2.Qxe5#
      • 1...Qxd2
        • 2.Sxd2#
        • 2.Qxe5#
      • 1...cxd2
        • 2.Sxd2#
        • 2.Sxe5#
        • 2.Qxe5#
      • 1...Re7
        • 2.Qxe5#
      • 1...c1Q
        • 2.Qxe5#
      • 1...c1S
        • 2.Qxe5#
      • 1...c1B
        • 2.Qxe5#
      • 1...c1R
        • 2.Qxe5#
      • 1...Qe2
        • 2.Qxe5#
      • 1...Qa1
        • 2.Qxe5#
      • 1...Qb1
        • 2.Qxe5#
      • 1...Qf1
        • 2.Qxe5#
      • 1...R4f5
        • 2.Sxe5#
        • 2.Sb6#
        • 2.Qd5#
      • 1...R7f5
        • 2.Sxe5#
        • 2.Sb6#
        • 2.Qd5#
      • 1...Rxe4!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qxe5#
      • 1...Rxc4+
        • 2.Bxc4#
      • 1...Bxd6+
        • 2.Raxd6#
      • 1...Bxh8
        • 2.Qd5#
      • 1...Re4
        • 2.Qxf7#
      • 1...R4f5
        • 2.Sb6#
      • 1...R7f5
        • 2.Qe8#
      • 1...Bd4
        • 2.Se5#
      • 1...Bf6
        • 2.Qd5#
      • 1...Bg7
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(e);CHECK,OGATE,P_SPINR(e),XS(G)::B(A),XR(e)
    • R(e);N_GUARD::QAB1(K),XR(i)
    • R(e);N_PINS(G)::B(A)+S(G)
    • R(i);OGATE,SBLOCK::QAR1(K)
    • B(f);CHECK,OGATE,P_SPINB(f),XP(J)::R1(I),XB(f)
  • Tries
    • Try
      • Q(K);N_SPINS(G),P_PINB(f)
      • Threat
        • DUALS(3)
      • Vars
        • R(i);::QAR1(K),XB(f)
        • P(b);::QAR1(K),XB(f)
        • Q(a);::QAR1(K),XB(f)
        • Q(a);P_PINP(B)::QAR1(K),XB(f)
      • Refutation
        • R(e);N_SPINB(f),P_PINS(G),XQ(K)
  • Actual
    • Q(K);
    • Threat
      • QAR1(K),XB(f)
    • Vars
      • R(e);CHECK,OGATE,P_SPINR(e),XS(G)::B(A),XR(e)
      • B(f);CHECK,OGATE,P_SPINB(f),XP(J)::R1(I),XB(f)
      • B(f);OGATE,XS(M)::QAB1(K)
      • R(e);N_GUARD::QAB1(K),XR(i)
      • R(e);N_PINS(G)::B(A)+S(G)
      • R(i);OGATE,SBLOCK::QAR2(K)
      • B(f);N_PINS(G)::B(A)+S(G)
      • B(f);OGATE::QAB1(K)
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).