MESON Chess Problem Database

Problem Display
PID: 227529 (1b6/1q3p2/7Q/RN2k3/1K2P1P1/2P3P1/8/1B2R3 w - - 0 1)

Cristoffanini, Guido

La Strategie, 1926

1b6/1q3p2/7Q/RN2k3/1K2P1P1/2P3P1/8/1B2R3

#2

10 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4+
      • 2.Sd4#
    • 1...Qc8
      • 2.Sc7#
    • 1...Qxb5+
      • 2.Rxb5#
    • 1...Qa7
      • 2.Sxa7#
    • 1...Qc7
      • 2.Sxc7#
    • 1...Qe7+
      • 2.Sd6#
    • 1...Bd6+
      • 2.Qxd6#
    • 1...Ba7
      • 2.Qd6#
  • Tries
    • 1.Rf1?
      • threat
        • 2.Rf5#
        • 2.Qf6#
      • 1...Qxb5+
        • 2.Rxb5#
      • 1...Qe7+
        • 2.Sd6#
      • 1...Bd6+
        • 2.Qxd6#
      • 1...f6
        • 2.Qxf6#
      • 1...Qa6
        • 2.Rf5#
      • 1...Qc6
        • 2.Rf5#
      • 1...Qc8
        • 2.Sc7#
        • 2.Qf6#
      • 1...Qb6
        • 2.Rf5#
      • 1...Qd7
        • 2.Qf6#
      • 1...f5
        • 2.Rxf5#
      • 1...Qxe4+!
    • 1.Qg5+?
      • 1...f5
        • 2.Qxf5#
      • 1...Ke6!
  • Keys
    • 1.Ba2!
      • threat
        • 2.Qf4#
      • 1...Qxe4+
        • 2.Sd4#
      • 1...Qxb5+
        • 2.Rxb5#
      • 1...Qe7+
        • 2.Sd6#
      • 1...Bd6+
        • 2.Qxd6#
      • 1...Qd5
        • 2.exd5#
      • 1...f5
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(b);CHECK,N_PINS(I),P_SPINQ(b),XP(F)::R(H)+S(I)
    • Q(b);N_PINS(I)::R(H)+S(I)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(I)::R(H),XQ(b)
    • Q(b);N_PINS(I)::R(H)+S(I),XQ(b)
    • Q(b);CHECK,N_PINS(I)::R(H)+S(I)
    • B(d);CHECK,N_GUARD::QAB1(J),XB(d)
    • B(d);N_GUARD::QAB1(J)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(I)::R(H),XQ(b)
        • Q(b);CHECK,N_PINS(I)::R(H)+S(I)
        • B(d);CHECK,N_GUARD::QAB1(J),XB(d)
        • P(c);::QAB1(J),XP(c)
        • Q(b);N_PINS(I)::R1(B)
        • Q(b);::R1(B)
        • Q(b);N_PINS(I)::QAB1(J)
        • P(c);::R1(B),XP(c)
      • Refutation
        • Q(b);CHECK,N_PINS(I),XP(F)
    • Try
      • Q(J);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAR1(J),XP(c)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • B(A);
    • Threat
      • QAB1(J)
    • Vars
      • Q(b);CHECK,N_PINS(I),P_SPINQ(b),XP(F)::R(H)+S(I)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(I)::R(H),XQ(b)
      • Q(b);CHECK,N_PINS(I)::R(H)+S(I)
      • B(d);CHECK,N_GUARD::QAB1(J),XB(d)
      • Q(b);N_PINS(I),OGATE::R(B)+P(F),XQ(b)
      • P(c);N_GUARD::QAR1(J)
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