MESON Chess Problem Database

Problem Display
PID: 148445 (q3r3/5Q2/3Rp2P/1nB1p1b1/2N1kpKp/3p2n1/7r/3N4 w - - 0 1)

Driver, John Edward

Chess, 1955

q3r3/5Q2/3Rp2P/1nB1p1b1/2N1kpKp/3p2n1/7r/3N4

#2

7 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Qxb7#
    • 1...Qa1
      • 2.Qb7#
    • 1...Qa2
      • 2.Qb7#
    • 1...Qa3
      • 2.Qb7#
    • 1...Qa4
      • 2.Qb7#
    • 1...Qa5
      • 2.Qb7#
    • 1...Qd8
      • 2.Qb7#
    • 1...Rh1
      • 2.Sf2#
      • 2.Sd2#
    • 1...Rd2
      • 2.Sxd2#
    • 1...Rf2
      • 2.Sxf2#
    • 1...Rh3
      • 2.Sf2#
      • 2.Sd2#
    • 1...Sf1
      • 2.Qg6#
      • 2.Qh7#
    • 1...Sh1
      • 2.Qg6#
      • 2.Qh7#
    • 1...Se2
      • 2.Sd2#
      • 2.Qg6#
      • 2.Qh7#
    • 1...Sh5
      • 2.Qg6#
      • 2.Qh7#
    • 1...Sa3
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Sd4
      • 2.Sc3#
    • 1...Sxd6
      • 2.Sc3#
    • 1...Sa7
      • 2.Sc3#
    • 1...Sc7
      • 2.Sc3#
    • 1...f3
      • 2.Qxf3#
  • Tries
    • 1.Rd4+?
      • 1...Sxd4
        • 2.Sc3#
      • 1...exd4!
  • Keys
    • 1.Bf2!
      • threat
        • 2.Sd2#
      • 1...Rxf2
        • 2.Sxf2#
      • 1...Sxd6
        • 2.Sc3#
      • 1...Qa2
        • 2.Qb7#
      • 1...Qa5
        • 2.Qb7#
      • 1...Sf1
        • 2.Qg6#
        • 2.Qh7#
      • 1...d2
        • 2.Sxd2#
      • 1...f3
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • Q(k);N_GUARD::QAB(G),XQ(k)
    • Q(k);N_GUARD::QAB(G)
    • R(a);N_GUARD::S(B),XR(a)
    • R(a);N_GUARD::S(A),XR(a)
    • S(g);N_GUARD::S(A)
    • S(g);N_GUARD::S(A),XS(g)
    • S(g);N_GUARD,XR(E)::S(A)
    • P(e);OGATE::QAB1(G),XP(e)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • S(g);XR(E)::S(A)
      • Refutation
        • P(h);XR(E)
  • Actual
    • B(D);
    • Threat
      • S(B)
    • Vars
      • R(a);XB(D)::S(A),XR(a)
      • S(g);N_GUARD,XR(E)::S(A)
      • Q(k);N_GUARD::QAB(G)
      • P(b);::S(B),XP(b)
      • P(e);OGATE::QAB1(G),XP(e)
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