MESON Chess Problem Database

Problem Display
PID: 61673 (4Q1N1/5nKp/3PR1P1/3k3r/R4p1q/B4p2/7p/3rnBbb w - - 0 1)

Dobbs, Gilbert S

The Chess Review, 1936

4Q1N1/5nKp/3PR1P1/3k3r/R4p1q/B4p2/7p/3rnBbb

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Sf6#
    • 1...Qg3
      • 2.Sf6#
    • 1...Qf6+
      • 2.Sxf6#
    • 1...Qh3
      • 2.Sf6#
    • 1...Qg4
      • 2.Sf6#
    • 1...Rd4
      • 2.Ra5#
    • 1...Rg5
      • 2.Sf6#
    • 1...Sg5
      • 2.Sf6#
      • 2.Re5#
    • 1...Sxd6
      • 2.Rxd6#
  • Tries
    • 1.Ra5+?
      • 1...Kd4
        • 2.Bb2#
      • 1...Bc5!
  • Keys
    • 1.Rf6!
      • threat
        • 2.Qe4#
      • 1...Qxf6+
        • 2.Sxf6#
      • 1...Sxd6
        • 2.Rxd6#
      • 1...Rd4
        • 2.Ra5#
      • 1...Re5
        • 2.Qa8#
      • 1...Bd4
        • 2.Bc4#
      • 1...Se5
        • 2.Se7#
      • 1...Sg5
        • 2.Rf5#
      • 1...f2
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_GUARD::S(I)
    • Q(h);N_GUARD,P_PINP(F)::S(I)
    • Q(h);CHECK,N_GUARD::S(I),XQ(h)
    • R(a);SBLOCK,S_CUTB(c)::R(C)
    • R(j);P_PINP(F),S_CUTQ(h)::S(I)
    • S(k);OGATE,XP(D)::R1(E),XS(k)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(i);P-FLIGHT::B(B)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • R(E);
    • Threat
      • QAB1(H)
    • Vars
      • Q(h);CHECK,XR(E)::S(I),XQ(h)
      • S(k);OGATE,XP(D)::R1(E),XS(k)
      • R(a);SBLOCK,S_CUTB(c)::R(C)
      • R(j);SBLOCK::QAB(H)
      • B(c);P_PINR(E),SBLOCK::B(A)
      • S(k);SBLOCK::S(I)
      • S(k);N_GUARD,S_CUTR(j)::R(E)
      • P(f);S_CUTB(c)::QAR2(H)
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