MESON Chess Problem Database

Problem Display
PID: 59448 (1R4Bn/q1p2N2/p1ppNKpr/2pk1nR1/Q4P2/7p/8/B7 w - - 0 1)

Rice, John Michael

WCSC, 1996

1R4Bn/q1p2N2/p1ppNKpr/2pk1nR1/Q4P2/7p/8/B7

#2

9 + 12

5396 World Chess Solving Championship 1977-1996 1997
5174 Chess Problem Spectrum 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Qa8
      • 2.Sxc7#
  • Tries
    • 1.Sed8?
      • threat
        • 2.Sxh8#
      • 1...Sxf7
        • 2.Bxf7#
      • 1...c4
        • 2.Qxc6#
      • 1...Rh7!
    • 1.Sxd6?
      • threat
        • 2.Qd1#
      • 1...Kxd6
        • 2.Rd8#
      • 1...cxd6
        • 2.Sc7#
      • 1...c4!
    • 1.Sfd8?
      • threat
        • 2.Sxc7#
      • 1...c4
        • 2.Qxc6#
      • 1...Sf7!
    • 1.Sxh8?
      • threat
        • 2.Sxc7#
        • 2.Sg7#
        • 2.Sd8#
        • 2.Sf8#
      • 1...Qxb8
        • 2.Sxc7#
        • 2.Sd8#
        • 2.Sf8#
      • 1...Rxh8
        • 2.Sxc7#
      • 1...Rh7
        • 2.Sxc7#
        • 2.Sg7#
      • 1...c4!
    • 1.Qd1+?
      • 1...Kc4
        • 2.Qb3#
      • 1...Ke4!
    • 1.Qb3+?
      • 1...c4
        • 2.Qf3#
      • 1...Ke4!
    • 1.Qa3?
      • threat
        • 2.Qd3#
      • 1...Kc4
        • 2.Qb3#
      • 1...c4
        • 2.Qf3#
      • 1...Ke4!
  • Keys
    • 1.Sxc5!
      • threat
        • 2.Qd4#
      • 1...Kxc5
        • 2.Qd4#
      • 1...Qxc5
        • 2.Sxh8#
      • 1...dxc5
        • 2.Rd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(j);N_GUARD::S(E),XP(k)
  • Tries
    • Try
      • S(E);
      • Threat
        • B(I)+S(G),XS(l)
      • Vars
        • S(l);OGATE,XS(G)::B(I),XS(l)
        • P(b);::QAB1(B),XP(f)
      • Refutation
        • R(i);
    • Try
      • S(G);XP(g)
      • Threat
        • QAR(B)
      • Vars
        • K(c);N_SPINS(d),OGATEB,P-FLIGHT,XS(G)::R(H)
        • P(k);SBLOCK,XS(G)::B(I)+S(E),DCHECK
      • Refutation
        • P(b);
    • Try
      • S(G);
      • Threat
        • B(I)+S(E),DCHECK,XP(k)
      • Vars
        • P(b);::QAB1(B),XP(f)
      • Refutation
        • S(l);
    • Try
      • S(G);XS(l)
      • Threat
        • DUALS(4)
      • Vars
        • R(i);XS(G)::B(I)+S(E),DCHECK,XP(k)
      • Refutation
        • P(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);N_SPINS(d),S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);N_SPINS(d),S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • P(b);P_SPINP(b),SBLOCK::QAB(B)
      • Refutation
        • K(c);N_SPINS(d),S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • K(c);N_SPINS(d),S_FLIGHT::QAB1(B)
        • P(b);SBLOCK::QAB(B)
      • Refutation
        • K(c);N_SPINS(d),S_FLIGHT
  • Actual
    • S(E);XP(b)
    • Threat
      • QAR1(B)
    • Vars
      • K(c);P-FLIGHT,XS(E)::QAB1(B)
      • Q(j);SBLOCK,XS(E)::B(I)+S(G),XS(l)
      • P(g);OGATEB,SBLOCK,XS(E)::R(H)
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