MESON Chess Problem Database

Problem Display
PID: 185796 (1Q6/4KB2/1B2n3/2n5/1p1k2P1/1q1p2P1/2PN3b/3N4 w - - 0 1)

Stallybrass, Don HR

Chess, 1957

1Q6/4KB2/1B2n3/2n5/1p1k2P1/1q1p2P1/2PN3b/3N4

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qd6#
    • 1...Qxc2
      • 2.Qd6#
    • 1...Qa4
      • 2.Qd6#
    • 1...Qb1
      • 2.Qd6#
    • 1...Qb2
      • 2.Qd6#
    • 1...Qa3
      • 2.Qd6#
    • 1...Qc3
      • 2.Qd6#
    • 1...Sf4
      • 2.Qxf4#
      • 2.Qh8#
    • 1...Sg5
      • 2.Qh8#
    • 1...Sc7
      • 2.Qh8#
    • 1...Sg7
      • 2.Qf4#
    • 1...Sd8
      • 2.Qf4#
    • 1...Sf8
      • 2.Qf4#
  • Tries
    • 1.Bxc5+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Sxc5
        • 2.Qh8#
      • 1...Kxc5!
    • 1.Qf4+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Sxf4!
    • 1.Qh8+?
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kd5!
    • 1.cxb3?
      • threat
        • 2.Qd6#
      • 1...Kd5
        • 2.Qd6#
      • 1...Sf4
        • 2.Qxf4#
        • 2.Qh8#
      • 1...Sc7
        • 2.Qh8#
      • 1...Bxg3!
    • 1.c3+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Qxc3
        • 2.Qd6#
      • 1...bxc3!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qe4#
      • 1...Ke5
        • 2.Sf3#
      • 1...Qd5
        • 2.Qa1#
      • 1...Sg5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 11
  • Sets
    • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(g)::QAR1(I)
    • Q(b);N_GUARD,XP(B)::QAR2(I)
    • Q(b);N_GUARD::QAR2(I)
    • S(g);N_GUARD::QAB(I)
    • S(g);N_GUARD::QAR2(I)
  • Tries
    • Try
      • B(F);CHECK,XS(f)
      • Vars
        • K(e);P-FLIGHT,P_SPINS(g)::QAR1(I)
        • S(g);SBLOCK,XB(F)::QAB(I)
      • Refutation
        • K(e);S_FLIGHT,XB(F)
    • Try
      • Q(I);CHECK
      • Vars
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(g)::QAR1(I)
      • Refutation
        • S(g);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • S(g);N_GUARD::QAB(I),XS(g)
      • Refutation
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(g)
    • Try
      • P(B);XQ(b)
      • Threat
        • QAR2(I)
      • Vars
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(g)::QAR1(I)
        • S(g);N_GUARD::QAB(I)
      • Refutation
        • B(a);XP(D)
    • Try
      • P(B);CHECK
      • Vars
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(g)::QAR1(I)
        • Q(b);XP(B)::QAR2(I)
      • Refutation
        • P(d);XP(B)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • K(e);N_SPINS(f),S_FLIGHT::S(C)
      • Q(b);N_GUARD,SBLOCK::QAB(I)
      • S(g);N_GUARD::QAB(I)
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