MESON Chess Problem Database

Problem Display
PID: 11182 (3K1n2/8/2Q5/p2n4/r3kB1N/3rP3/2B5/1b2R3 w - - 0 1)

Dobbs, Gilbert S

Chess, 1937

3K1n2/8/2Q5/p2n4/r3kB1N/3rP3/2B5/1b2R3

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qc4#
    • 1...Ra2
      • 2.Qc4#
    • 1...Ra3
      • 2.Qc4#
    • 1...Rc4
      • 2.Qxc4#
    • 1...Se6+
      • 2.Qxe6#
    • 1...Sg6
      • 2.Qxg6#
    • 1...Sd7
      • 2.Qg6#
    • 1...Sh7
      • 2.Qe6#
      • 2.Qg6#
  • Tries
    • 1.Qe8+?
      • 1...Se6+
        • 2.Qxe6#
      • 1...Se7+!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qe5#
      • 1...Se6+
        • 2.Qxe6#
      • 1...Sxe3
        • 2.Rxe3#
      • 1...Sxf4
        • 2.exf4#
      • 1...Sc3
        • 2.Qxd3#
      • 1...Sb4
        • 2.Qd4#
      • 1...Sb6
        • 2.Qxd3#
      • 1...Sf6
        • 2.Qxd3#
      • 1...Sc7
        • 2.Qxd3#
      • 1...Se7
        • 2.Qxd3#
      • 1...Sg6
        • 2.Qxg6#
      • 1...Sd7
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 4
  • Sets
    • R(c);N_GUARD::QAR2(F)
    • R(c);N_GUARD::QAR2(F),XR(c)
    • S(g);CHECK,N_GUARD::QAR2(F),XS(g)
    • S(g);N_GUARD::QAB(F),XS(g)
    • S(g);N_GUARD::QAB(F)
  • Tries
    • Try
      • Q(F);CHECK,N_PINS(f)
      • Vars
        • S(g);CHECK,N_GUARD,P_SPINS(g)::QAR2(F),XS(g)
      • Refutation
        • S(f);CHECK,P_SPINS(f)
  • Actual
    • Q(F);N_PINS(f)
    • Threat
      • QAR1(F)
    • Vars
      • S(g);CHECK,N_GUARD::QAR2(F),XS(g)
      • S(f);OGATE,P_PINQ(F),P_SPINS(f),XP(C)::R1(A),XS(f)
      • S(f);OGATE,P_PINQ(F),XB(D)::R(A)+P(C),XS(f)
      • S(f);OGATE,P_PINQ(F)::QAB1(F),XR(b)
      • S(f);OGATE,P_PINQ(F)::QAR1(F)
      • S(g);N_GUARD::QAB(F),XS(g)
      • S(g);N_GUARD::QAB(F)
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