MESON Chess Problem Database

Problem Display
PID: 58058 (1b1RR3/3p4/2p5/2pk1N2/2r1n1pK/1P1n2pN/b2pQ3/5BB1 w - - 0 1)

Driver, John Edward

Chess Life, 1958

1b1RR3/3p4/2p5/2pk1N2/2r1n1pK/1P1n2pN/b2pQ3/5BB1

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Qxd3#
      • 2.Qxe4#
    • 1...Rc2
      • 2.Qxd3#
      • 2.Qxe4#
    • 1...Rc3
      • 2.Qxe4#
    • 1...Sc1
      • 2.Qxc4#
    • 1...Se1
      • 2.Qxc4#
    • 1...Sdf2
      • 2.Qxc4#
    • 1...Sb4
      • 2.Qxc4#
    • 1...Sf4
      • 2.Qxc4#
    • 1...Se5
      • 2.Sf4#
    • 1...Sef2
      • 2.Qe6#
    • 1...Sc3
      • 2.Qe6#
    • 1...Sd6
      • 2.Se7#
    • 1...Sf6
      • 2.Qe6#
  • Tries
    • 1.Sf4+?
      • 1...Sxf4
        • 2.Qxc4#
      • 1...Bxf4!
    • 1.Se3+?
      • 1...Kd4
        • 2.Qxd3#
      • 1...Kd6!
    • 1.Rxd7+?
      • 1...Sd6
        • 2.Se7#
        • 2.Qe6#
      • 1...Bd6!
    • 1.bxc4+?
      • 1...Bxc4
        • 2.Qxe4#
      • 1...Kxc4!
  • Keys
    • 1.Qxg4!
      • threat
        • 2.Qg8#
      • 1...Sf4
        • 2.Bxc4#
      • 1...Se5
        • 2.Sf4#
      • 1...Sef2
        • 2.Qxc4#
      • 1...Sc3
        • 2.Qxc4#
      • 1...Sg5
        • 2.Qxc4#
      • 1...Sd6
        • 2.Se3#
      • 1...Sf6
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(e);N_GUARD::QAB1(C),XS(f)
    • S(c);OGATE::QAB1(C),XR(e)
    • S(c);N_GUARD,S_CUTB(l)::S(E)
    • S(f);OGATE::QAB1(C)
    • S(f);N_SPINP(k),SBLOCK::S(G)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(c);OGATE,XS(E)::QAB1(C),XR(e)
      • Refutation
        • B(l);XS(E)
    • Try
      • S(G);CHECK
      • Vars
        • K(i);P-FLIGHT::QAR1(C),XS(c)
      • Refutation
        • K(i);P-FLIGHT
    • Try
      • R(H);CHECK,XP(k)
      • Refutation
        • B(l);P_SPINB(l)
    • Try
      • P(D);CHECK,XR(e)
      • Vars
        • B(a);XP(D)::QAB1(C),XS(f)
      • Refutation
        • K(i);N_SPINP(k),P_SPINS(c),S_FLIGHT,XP(D)
  • Actual
    • Q(C);XP(g)
    • Threat
      • QAB(C)
    • Vars
      • S(c);OGATE::B(A),XR(e)
      • S(c);N_GUARD,S_CUTB(l)::S(E)
      • S(f);OGATE,P_PINQ(C)::QAB1(C),XR(e)
      • S(f);N_SPINP(k),P_PINQ(C),SBLOCK::S(G)
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