MESON Chess Problem Database

Problem Display
PID: 12100 (b4K2/5p2/3N4/6Np/6kP/3r2B1/4qP1R/1QnB2R1 w - - 0 1)

Quack, Godfrey C

The Problemist, 1974

b4K2/5p2/3N4/6Np/6kP/3r2B1/4qP1R/1QnB2R1

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Be5#
    • 1...Rxd1
      • 2.Qf5#
    • 1...Rd2
      • 2.Qf5#
    • 1...Ra3
      • 2.Qf5#
    • 1...Rb3
      • 2.Qf5#
    • 1...Rc3
      • 2.Qf5#
    • 1...Re3
      • 2.Qf5#
    • 1...Rxg3
      • 2.Qf5#
    • 1...Rd4
      • 2.Qf5#
    • 1...Rd5
      • 2.Be5#
      • 2.Qe4#
  • Tries
    • 1.Bxe2+?
      • 1...Rf3
        • 2.Be5#
        • 2.Qf5#
      • 1...Bf3
        • 2.Be5#
      • 1...Sxe2!
    • 1.Be5+?
      • 1...Rg3
        • 2.Rxg3#
        • 2.Qf5#
      • 1...Bg2!
    • 1.Qxd3?
      • threat
        • 2.Qf5#
      • 1...Be4
        • 2.Qxe4#
      • 1...f5
        • 2.Qxf5#
      • 1...Sxd3!
    • 1.Qb4+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Rd4!
  • Keys
    • 1.Sgxf7!
      • threat
        • 2.Se5#
      • 1...Kf3
        • 2.Se5#
      • 1...Rxd1
        • 2.Qf5#
      • 1...Rxg3
        • 2.Qf5#
      • 1...Qf3
        • 2.Be5#
      • 1...Re3
        • 2.Qf5#
      • 1...Rf3
        • 2.Qg6#
      • 1...Rd5
        • 2.Qe4#
      • 1...Bf3
        • 2.Sh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(b);S_CUTB(g),S_CUTR(c)::R(C)+B(F)
    • R(c);N_SPINQ(b),OGATE,XB(B)::QAB1(A)
    • R(c);OGATE::QAB1(A)
    • R(c);OGATE,P_SPINR(c),XB(F)::QAB1(A)
  • Tries
    • Try
      • B(B);CHECK,XQ(b)
      • Vars
        • B(g);P_SPINB(g)::R(C)+B(F)
      • Refutation
        • S(a);XB(B)
    • Try
      • B(F);CHECK
      • Refutation
        • B(g);P_SPINB(g)
    • Try
      • Q(A);XR(c)
      • Threat
        • QAB1(A)
      • Vars
        • B(g);N_GUARD::QAR2(A),XB(g)
        • P(f);::QAB1(A),XP(f)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR2(A),XB(g)
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • S(H);XP(f)
    • Threat
      • S(H)
    • Vars
      • K(d);S_FLIGHT::S(H)
      • R(c);N_SPINQ(b),OGATE,XB(B)::QAB1(A)
      • R(c);OGATE,P_SPINR(c),XB(F)::QAB1(A)
      • Q(b);P_PINS(H),S_CUTB(g),S_CUTR(c)::R(C)+B(F)
      • R(c);OGATE::QAB1(A)
      • R(c);N_SPINQ(b),OGATE,P_PINS(H),SBLOCK::QAR2(A)
      • R(c);OGATE::QAR2(A)
      • B(g);N_SPINQ(b),SBLOCK::S(H)
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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).