MESON Chess Problem Database

Problem Display
PID: 65339 (1q1bR3/7N/4n2K/R2n2p1/r3kNP1/r4p2/2P2PP1/BB1Q3b w - - 0 1)

Gooderson, Arthur R

The Problemist, 1968

1q1bR3/7N/4n2K/R2n2p1/r3kNP1/r4p2/2P2PP1/BB1Q3b

#2

12 + 10

56 The Problemist 2006

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf4
      • 2.Qxd5#
    • 1...Ra2
      • 2.Qxf3#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rxa5
      • 2.Qd4#
    • 1...Se3
      • 2.Qxf3#
    • 1...Sb4
      • 2.Qd4#
    • 1...gxf4
      • 2.Qxd5#
  • Tries
    • 1.Sh5?
      • threat
        • 2.Qxd5#
      • 1...Rxa5
        • 2.Qd4#
      • 1...Bxa5
        • 2.Sxg5#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.c3#
      • 1...Qb3
        • 2.Rxe6#
        • 2.cxb3#
      • 1...Qb5
        • 2.Rxe6#
      • 1...Qb7
        • 2.Rxe6#
      • 1...Qa8
        • 2.Rxe6#
      • 1...Rd3
        • 2.Qxd3#
        • 2.cxd3#
      • 1...Sc3
        • 2.Qd3#
      • 1...Se3
        • 2.Qxf3#
      • 1...Sb4
        • 2.Qd4#
      • 1...Sf4
        • 2.Sg3#
      • 1...Sb6
        • 2.c3#
      • 1...Sf6
        • 2.Sxg5#
      • 1...Sc7
        • 2.Re5#
      • 1...Se7
        • 2.S7f6#
      • 1...Qd6!
    • 1.Rxa4+?
      • 1...Rxa4
        • 2.Qxf3#
      • 1...Sb4
        • 2.Qd4#
      • 1...Qb4!
    • 1.Qd3+?
      • 1...Kxf4
        • 2.Qf5#
      • 1...Rxd3!
    • 1.c4+?
      • 1...Qxb1
        • 2.Qd4#
      • 1...Rd3
        • 2.Qxf3#
      • 1...Kxf4!
  • Keys
    • 1.Qxd5+!
      • 1...Kxf4
        • 2.Qf5#

This is a version

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(i);SBLOCK,XS(G)::QAB1(C),XS(f)
    • R(b);N_GUARD::QAB1(C),XP(c)
    • R(d);N_GUARD::QAR1(C),XR(d)
    • R(d);N_GUARD,XR(I)::QAR1(C)
    • S(f);S_CUTR(b)::QAB1(C),XP(c)
    • S(f);S_CUTR(d)::QAR1(C)
    • P(g);SBLOCK,XS(G)::QAB1(C),XS(f)
  • Tries
    • Try
      • S(G);
      • Threat
        • QAB1(C),XS(f)
      • Vars
        • R(d);N_GUARD,XR(I)::QAR1(C)
        • B(j);N_GUARD,XR(I)::S(K),XP(g)
        • R(d);N_GUARD::QAR1(C),XR(d)
        • Q(i);N_GUARD,N_SPINS(h),SBLOCK::B(B)+P(D)
        • Q(i);N_GUARD::R(L),XS(h)
        • S(f);S_CUTR(b)::QAB1(C)
        • S(f);S_CUTR(b)::QAB1(C),XP(c)
        • S(f);S_CUTR(d)::QAR1(C)
        • S(f);SBLOCK,S_CUTQ(i)::S(G)
        • S(f);S_CUTQ(i)::B(B)+P(D)
        • S(f);S_CUTB(j)::S(K),XP(g)
        • S(f);OGATE::R1(I)
        • S(f);N_GUARD,N_SPINS(h),S_CUTB(j)::S(K)
      • Refutation
        • Q(i);
    • Try
      • R(I);CHECK,XR(d)
      • Vars
        • R(b);XR(I)::QAB1(C),XP(c)
        • S(f);N_SPINS(h),P_SPINS(f)::QAR1(C)
      • Refutation
        • Q(i);P_SPINQ(i)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);N_SPINS(h),OGATE,P-FLIGHT,XS(G)::QAR1(C)
      • Refutation
        • R(b);XQ(C)
    • Try
      • P(D);CHECK
      • Vars
        • Q(i);XB(B)::QAR1(C)
        • R(b);P_SPINR(b)::QAB1(C),XP(c)
      • Refutation
        • K(e);N_SPINS(h),P-FLIGHT,XS(G)
  • Actual
    • Q(C);CHECK,XS(f)
    • Vars
      • K(e);N_SPINS(h),P-FLIGHT,XS(G)::QAR1(C)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).