MESON Chess Problem Database

Problem Display
PID: 149676 (8/p1Q2B2/3p2N1/p7/Rbnk1K2/1q1bpp2/N1P2r2/3R4 w - - 0 1)

Stephenson, Brian D

1st Comm., Problem Observer, 1991

8/p1Q2B2/3p2N1/p7/Rbnk1K2/1q1bpp2/N1P2r2/3R4

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa2
      • 2.Rxd3#
    • 1...Qxa4
      • 2.Rxd3#
      • 2.Qxc4#
    • 1...Qb1
      • 2.Rxd3#
      • 2.Qxc4#
    • 1...Qb2
      • 2.Rxd3#
      • 2.Qxc4#
    • 1...Qa3
      • 2.Qxc4#
    • 1...Be1
      • 2.Qxd6#
    • 1...Bd2
      • 2.Qxd6#
    • 1...Bc3
      • 2.Rxd3#
      • 2.Qxd6#
    • 1...Sb2
      • 2.Qxa7#
    • 1...Sd2
      • 2.Qxa7#
    • 1...Sa3
      • 2.Qxa7#
    • 1...Se5
      • 2.Qxa7#
  • Tries
    • 1.Se7?
      • threat
        • 2.Sf5#
      • 1...Qxa2
        • 2.Rxd3#
      • 1...Bd2
        • 2.Qxd6#
      • 1...Sd2
        • 2.Qxa7#
      • 1...Rd2!
    • 1.Rxb4?
      • threat
        • 2.Qxd6#
        • 2.Qxa7#
      • 1...Qxa2
        • 2.Rxd3#
      • 1...Qxb4
        • 2.Rxd3#
      • 1...d5
        • 2.Qxa7#
      • 1...a6
        • 2.Qb6#
        • 2.Qxd6#
        • 2.Qa7#
      • 1...axb4!
    • 1.Qxa7+?
      • 1...Sb6
        • 2.Qxb6#
      • 1...Bc5!
    • 1.c3+?
      • 1...Bxc3
        • 2.Qxd6#
      • 1...Qxc3!
  • Keys
    • 1.Sh4!
      • threat
        • 2.Sf5#
      • 1...Qxa2
        • 2.Rxd3#
      • 1...Rd2
        • 2.Sxf3#
      • 1...Bd2
        • 2.Qxd6#
      • 1...Sd2
        • 2.Qxa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD,XS(B)::R1(A),XB(c)
    • Q(b);N_GUARD::QAR1(G),XS(g)
    • B(f);N_GUARD,P_SPINS(g)::QAR2(G),XP(j)
    • B(f);N_GUARD,N_SPINB(c),P_SPINS(g)::QAR2(G),XP(j)
    • S(g);N_GUARD,S_CUTB(f)::QAB(G),XP(k)
    • S(g);N_GUARD,N_SPINB(c),P_SPINB(f)::QAB(G),XP(k)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • Q(b);N_GUARD,XS(B)::R1(A),XB(c)
        • B(f);N_GUARD,N_SPINB(c),P_SPINS(g)::QAR2(G),XP(j)
        • S(g);N_GUARD,N_SPINB(c),P_SPINB(f)::QAB(G),XP(k)
      • Refutation
        • R(a);N_SPINB(c)
    • Try
      • R(D);P_PINS(g),XB(f)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);N_GUARD,XS(B)::R1(A),XB(c)
        • Q(b);N_GUARD,N_SPINS(g),XR(D)::R1(A),XB(c)
        • P(j);::QAB(G),XP(k)
      • Refutation
        • P(i);N_SPINS(g),XR(D)
    • Try
      • Q(G);CHECK,XP(k)
      • Vars
        • S(g);N_GUARD,P_SPINS(g),S_CUTB(f)::QAB(G),XS(g)
      • Refutation
        • B(f);P_SPINS(g)
    • Try
      • P(C);CHECK
      • Vars
        • B(f);P_SPINS(g),XP(C)::QAR2(G),XP(j)
      • Refutation
        • Q(b);XP(C)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • Q(b);N_GUARD,XS(B)::R1(A),XB(c)
      • R(a);N_GUARD,N_SPINB(c)::S(F),XP(e)
      • B(f);N_GUARD,N_SPINB(c),P_SPINS(g)::QAR2(G),XP(j)
      • S(g);N_GUARD,N_SPINB(c),P_SPINB(f)::QAB(G),XP(k)
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