MESON Chess Problem Database

Problem Display
PID: 225172 (8/3K4/2R2P2/P3k1p1/R2prNp1/8/1Q5P/bB6 w - - 0 1)

Rizzetti, Dante Hugo

US Problem Bulletin, 1967

8/3K4/2R2P2/P3k1p1/R2prNp1/8/1Q5P/bB6

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Qb8#
    • 1...Re2
      • 2.Qb8#
    • 1...Re3
      • 2.Qb8#
    • 1...Rxf4
      • 2.Qb5#
    • 1...gxf4
      • 2.Qb5#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Ba2#
        • 2.Rc5#
        • 2.Rd6#
        • 2.Qa2#
        • 2.Qb3#
        • 2.Qb5#
      • 1...Kf5!
    • 1.Sh5?
      • threat
        • 2.Rc5#
        • 2.Qb5#
      • 1...Kd5
        • 2.Qb5#
      • 1...Bxb2
        • 2.Rc5#
      • 1...Kf5!
    • 1.Sg6+?
      • 1...Kd5
        • 2.Ba2#
        • 2.Qa2#
        • 2.Qb3#
        • 2.Qb5#
      • 1...Kf5!
    • 1.Rc5+?
      • 1...Kxf4
        • 2.Qf2#
      • 1...Kxf6!
    • 1.Re6+?
      • 1...Kxf4
        • 2.Qf2#
      • 1...Kf5!
    • 1.Qc2?
      • threat
        • 2.Qxe4#
      • 1...Kxf4
        • 2.Qxe4#
      • 1...Kf5
        • 2.Qxe4#
      • 1...Rxf4
        • 2.Qc5#
      • 1...Re1
        • 2.Qf5#
      • 1...Re2
        • 2.Qf5#
      • 1...Re3
        • 2.Qf5#
      • 1...d3!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qxe4#
      • 1...Kxf4
        • 2.Qxe4#
      • 1...Kf5
        • 2.Qxe4#
      • 1...Rxf4
        • 2.Re6#
      • 1...Re3
        • 2.Sg6#
      • 1...Re1
        • 2.Sg6#
      • 1...Re2
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(c);::QAB(B)
    • R(c);SBLOCK,XS(E)::QAR(B)
    • P(f);SBLOCK,XS(E)::QAR(B)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(e);N_SPINP(b),P-FLIGHT
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • K(e);N_SPINP(b),P-FLIGHT::QAR2(B)
        • B(a);N_SPINP(b),XQ(B)::R(G)
      • Refutation
        • K(e);N_SPINP(b),P-FLIGHT,P_SPINR(c)
    • Try
      • S(E);CHECK
      • Refutation
        • K(e);N_SPINP(b),P-FLIGHT,P_SPINR(c)
    • Try
      • R(G);CHECK
      • Vars
        • K(e);N_SPINP(b),S_FLIGHT,XS(E)::QAR2(B)
      • Refutation
        • K(e);S_FLIGHT,XP(H)
    • Try
      • R(G);CHECK
      • Vars
        • K(e);N_SPINP(b),S_FLIGHT,XS(E)::QAR2(B)
      • Refutation
        • K(e);N_SPINP(b),P-FLIGHT,P_SPINR(c)
    • Try
      • Q(B);N_PINP(b)
      • Threat
        • QAR1(B),XR(c)
      • Vars
        • K(e);S_FLIGHT,XS(E)::QAR1(B),XR(c)
        • K(e);P-FLIGHT,P_SPINR(c)::QAB1(B),XR(c)
        • R(c);SBLOCK,XS(E)::QAR2(B)
        • R(c);OGATE::QAR1(B)
      • Refutation
        • P(b);
  • Actual
    • Q(B);N_PINP(b)
    • Threat
      • QAR1(B),XR(c)
    • Vars
      • K(e);S_FLIGHT,XS(E)::QAR1(B),XR(c)
      • K(e);P-FLIGHT,P_SPINR(c)::QAB1(B),XR(c)
      • R(c);SBLOCK,XS(E)::R1(G)
      • R(c);::S(E)
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