MESON Chess Problem Database

Problem Display
PID: 11190 (5R1n/2N1Pnp1/5qP1/2RN1k2/3B4/3P4/3Q4/2KB4 w - - 0 1)

Evans, TC

Chess, 1937

5R1n/2N1Pnp1/5qP1/2RN1k2/3B4/3P4/3Q4/2KB4

#2

11 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Sf4#
    • 1...Qg5
      • 2.Sf4#
    • 1...Qxe7
      • 2.Sxe7#
    • 1...Qa6
      • 2.Sf4#
    • 1...Qxg6
      • 2.Sc3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Qf4#
    • 1...Sg5
      • 2.Sf4#
    • 1...Sd6
      • 2.Sf4#
    • 1...Sh6
      • 2.Sf4#
    • 1...Sd8
      • 2.Sf4#
  • Tries
    • 1.Se3+?
      • 1...Kf4
        • 2.Sf1#
        • 2.Sf5#
        • 2.Qf2#
        • 2.Qh2#
      • 1...Kxg6!
    • 1.Sf4+?
      • 1...Se5
        • 2.Rxe5#
      • 1...Qe5!
    • 1.Sxf6+?
      • 1...Kxg6
        • 2.Bh5#
      • 1...Se5!
    • 1.e8S?
      • threat
        • 2.Se7#
      • 1...Qe7
        • 2.Sxe7#
      • 1...Kxg6!
  • Keys
    • 1.Qh2!
      • 1...Qg5+
        • 2.Sf4#
      • 1...Kg5
        • 2.Qh5#
      • 1...Kxg6
        • 2.Qh5#
      • 1...Qxd4
        • 2.Qh5#
      • 1...Qxe7
        • 2.Sxe7#
      • 1...Qxg6
        • 2.Sc3#
        • 2.Se3#
        • 2.Sb4#
        • 2.Sf4#
        • 2.Sb6#
        • 2.Qf4#
        • 2.Qe5#
      • 1...Sxg6
        • 2.Se3#
      • 1...Qe5
        • 2.Qh5#
      • 1...Qh4
        • 2.Sf4#
      • 1...Qa6
        • 2.Sf4#
        • 2.Qh5#
      • 1...Qb6
        • 2.Qh5#
      • 1...Qc6
        • 2.Qh5#
      • 1...Qd6
        • 2.Qh5#
      • 1...Qe6
        • 2.Qh5#
      • 1...Se5
        • 2.Qh5#
      • 1...Sg5
        • 2.Sf4#
      • 1...Sd6
        • 2.Sf4#
        • 2.Qh5#
      • 1...Sh6
        • 2.Sf4#
        • 2.Qh5#
      • 1...Sd8
        • 2.Sf4#
        • 2.Qh5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD,P_SPINS(c)::R(F)+S(G)
    • Q(b);N_GUARD,P_PINQ(C),P_SPINS(c),SBLOCK::R(F)+S(G)
    • Q(b);P_SPINS(c),XP(J)::R(F)+S(G),DCHECK,XQ(b)
    • S(c);N_GUARD,P_SPINQ(b),SBLOCK::R(F)+S(G)
    • S(c);N_GUARD,P_SPINQ(b)::R(F)+S(G)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • K(a);S_FLIGHT,XP(H)
    • Try
      • S(G);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINQ(b),P_SPINS(c)::R1(F),XS(c)
      • Refutation
        • Q(b);P_SPINQ(b),P_SPINS(c)
    • Try
      • S(G);CHECK,XQ(b)
      • Vars
        • K(a);S_FLIGHT,XP(H)::B(B)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • P(J);
      • Threat
        • R(F)+S(G),DCHECK
      • Vars
        • Q(b);P_SPINS(c)::R(F)+S(G),DCHECK,XQ(b)
      • Refutation
        • K(a);S_FLIGHT,XP(H)
  • Actual
    • Q(C);
    • Vars
      • Q(b);CHECK,N_GUARD,P_SPINS(c),SBLOCK::R(F)+S(G)
      • K(a);P-FLIGHT::QAR1(C)
      • K(a);S_FLIGHT,XP(H)::QAB1(C)
      • Q(b);N_GUARD,P_SPINS(c),XB(E)::QAR2(C)
      • Q(b);P_SPINS(c),XP(J)::R(F)+S(G),DCHECK,XQ(b)
      • S(e);SBLOCK,XP(H)::R(F)+S(G),DCHECK
      • Q(b);N_GUARD,P_SPINS(c)::QAR2(C)
      • Q(b);N_GUARD,P_SPINS(c)::R(F)+S(G)
      • Q(b);N_GUARD,P_PINR(F),P_SPINS(c)::QAR2(C)
      • S(c);N_GUARD,P_SPINQ(b)::QAR2(C)
      • S(c);N_GUARD,P_SPINQ(b),SBLOCK::R(F)+S(G)
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).