MESON Chess Problem Database

Problem Display
PID: 11487 (3n4/n3B2K/4RPPp/3k1p1R/Q2Np3/2b1pqp1/b7/8 w - - 0 1)

Dobbs, Gilbert S

Chess, 1939

3n4/n3B2K/4RPPp/3k1p1R/Q2Np3/2b1pqp1/b7/8

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Rxf5#
    • 1...Qh1
      • 2.Rxf5#
    • 1...Qe2
      • 2.Rxf5#
    • 1...Qg2
      • 2.Rxf5#
    • 1...Bc4
      • 2.Qd7#
    • 1...Bxd4
      • 2.Qxa2#
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Qxa2#
      • 1...Kxe6
        • 2.Sg7#
      • 1...Qxf5
        • 2.Qxe4#
      • 1...Sxe6
        • 2.Sxe3#
      • 1...Qd1
        • 2.Qxe4#
      • 1...Qe2
        • 2.Qxe4#
      • 1...Qg2
        • 2.Sd4#
      • 1...Qf1
        • 2.Qxe4#
      • 1...Qf2
        • 2.Qxe4#
      • 1...Bb1
        • 2.Qb3#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bc4
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • Q(d);N_GUARD::R(C),XP(h)
    • B(a);SBLOCK::QAR2(A)
    • B(b);SBLOCK,XS(B)::QAB(A),XB(a)
  • Actual
    • S(B);XP(h)
    • Threat
      • QAB(A),XB(a)
    • Vars
      • K(g);S_FLIGHT,XR(D)::S(B)
      • Q(d);N_GUARD,P_PINP(F),P_SPINQ(d),XS(B)::QAB1(A),XP(f)
      • S(k);SBLOCK,XR(D)::R(C)+S(B),DCHECK,XP(c)
      • Q(d);N_GUARD::QAB1(A),XP(f)
      • Q(d);N_GUARD::R(C)+S(B)
      • B(a);N_GUARD::QAB(A)
      • B(a);N_GUARD::QAB(A),XB(a)
      • B(a);SBLOCK::QAR2(A)
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