MESON Chess Problem Database

Problem Display
PID: 204221 (Bqn5/8/2N1R3/r3NPKp/pp1Pk1p1/4P3/Q1P1Rp2/3n3r w - - 0 1)

Caine, Walter Edmund

The Problemist, 1954

Bqn5/8/2N1R3/r3NPKp/pp1Pk1p1/4P3/Q1P1Rp2/3n3r

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Sxa5#
    • 1...Rxe5
      • 2.Sxb8#
  • Tries
    • 1.Sd3+?
      • 1...Qe5
        • 2.Sxa5#
      • 1...Re5
        • 2.Sxb8#
      • 1...Kf3!
    • 1.Sf3+?
      • 1...Qe5
        • 2.Sd2#
        • 2.Sxa5#
      • 1...Re5
        • 2.Sd2#
        • 2.Sxb8#
      • 1...Kxf3!
    • 1.Sc4+?
      • 1...Kd5
        • 2.Sb6#
        • 2.Sxb4#
        • 2.Se7#
        • 2.e4#
      • 1...Qe5
        • 2.Sd2#
        • 2.S6xa5#
      • 1...Re5
        • 2.Sd2#
        • 2.Sxb8#
      • 1...Kf3!
    • 1.Sxg4+?
      • 1...Qe5
        • 2.Sxa5#
      • 1...Re5
        • 2.Sxb8#
      • 1...Kf3!
    • 1.Sg6+?
      • 1...Qe5
        • 2.Sxa5#
      • 1...Re5
        • 2.Sxb8#
      • 1...Kf3!
    • 1.Sd7+?
      • 1...Qe5
        • 2.Sxa5#
      • 1...Re5
        • 2.Scxb8#
      • 1...Kf3!
    • 1.Sf7+?
      • 1...Qe5
        • 2.Sxa5#
      • 1...Re5
        • 2.Sxb8#
      • 1...Kf3!
    • 1.Sxa5+?
      • 1...Qb7
        • 2.Bxb7#
      • 1...Qxa8!
    • 1.Sxb8+?
      • 1...Rd5
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Rxa8!
    • 1.Qd5+?
      • 1...Kxd5
        • 2.Sxb4#
        • 2.Se7#
        • 2.e4#
      • 1...Rxd5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.c4#
      • 1...Kd5
        • 2.Sxb4#
        • 2.Se7#
        • 2.e4#
      • 1...Qxe5
        • 2.Sxa5#
      • 1...Rxe5
        • 2.Sxb8#
      • 1...Sxe3
        • 2.Qxh1#
      • 1...Sb2
        • 2.Qxh1#
      • 1...Sc3
        • 2.Qxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(j);N_GUARD,P_PINP(G),P_SPINQ(j),XS(F)::B(K)+S(I),XR(h)
    • R(h);N_GUARD,P_PINP(G),P_SPINR(h),XS(F)::B(K)+S(I),XQ(j)
  • Tries
    • Try
      • S(F);CHECK,P_SPINP(G)
      • Vars
        • Q(j);P_SPINQ(j)::B(K)+S(I),XR(h)
        • R(h);P_SPINR(h)::B(K)+S(I),XQ(j)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINP(G)
      • Refutation
        • K(f);S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK,P_SPINP(G)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINP(G),XP(g)
      • Vars
        • Q(j);P_SPINQ(j)::B(K)+S(I),XR(h)
        • R(h);P_SPINR(h)::B(K)+S(I),XQ(j)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINP(G)
      • Vars
        • Q(j);P_SPINQ(j)::B(K)+S(I),XR(h)
        • R(h);P_SPINR(h)::B(K)+S(I),XQ(j)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINP(G)
      • Vars
        • Q(j);P_SPINQ(j)::B(K)+S(I),XR(h)
        • R(h);P_SPINR(h)::B(K)+S(I),XQ(j)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINP(G)
      • Vars
        • Q(j);P_SPINQ(j)::B(K)+S(I),XR(h)
        • R(h);P_SPINR(h)::B(K)+S(I),XQ(j)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(I);CHECK,XR(h)
      • Vars
        • Q(j);N_GUARD,P_SPINQ(j)::B(K),XQ(j)
      • Refutation
        • Q(j);XB(K)
    • Try
      • S(I);CHECK,XQ(j)
      • Refutation
        • R(h);XB(K)
    • Try
      • Q(A);CHECK
      • Refutation
        • R(h);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+P(B)
    • Vars
      • Q(j);N_GUARD,P_PINP(G),P_SPINQ(j),XS(F)::B(K)+S(I),XR(h)
      • R(h);N_GUARD,P_PINP(G),P_SPINR(h),XS(F)::B(K)+S(I),XQ(j)
      • S(a);OGATE,P_SPINS(a),XP(D)::QAB(A),XR(b)
      • S(a);OGATE::QAB(A),XR(b)
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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).