MESON Chess Problem Database

Problem Display
PID: 227552 (2R2BB1/1q2N3/2N3P1/P1k2P2/P3KQ2/8/2p3nb/8 w - - 0 1)

Mari, Alberto

L'Italia Scacchistica, 1926

2R2BB1/1q2N3/2N3P1/P1k2P2/P3KQ2/8/2p3nb/8

#2

11 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc6+
      • 2.Sxc6#
    • 1...Qb4+
      • 2.Sd4#
    • 1...Qxe7+
      • 2.Bxe7#
    • 1...Bg1
      • 2.Qe5#
  • Tries
    • 1.Sd5+?
      • 1...Qe7+
        • 2.Scxe7#
      • 1...Kc4!
    • 1.Qe3+?
      • 1...Kd6
        • 2.Qd4#
      • 1...Sxe3!
    • 1.Qf2+?
      • 1...Kd6
        • 2.Qd4#
      • 1...Se3!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qd4#
        • 2.Qd5#
      • 1...Qxc6+
        • 2.Rxc6#
      • 1...Qb4+
        • 2.Qxb4#
      • 1...Qxe7+
        • 2.Se5#
      • 1...Qb2
        • 2.Se5#
        • 2.Qd5#
      • 1...Qb3
        • 2.Se5#
        • 2.Qd4#
      • 1...Qd7
        • 2.Qb4#
      • 1...Bg1
        • 2.Qd5#
      • 1...Be5
        • 2.Qd5#
      • 1...Se3
        • 2.Qd4#
      • 1...Sf4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(e);CHECK,P_SPINQ(e),XS(F)::B(J)+S(H),XQ(e)
    • Q(e);CHECK,N_PINS(F),SBLOCK::R(I)+S(F)
    • Q(e);CHECK,N_PINS(F),OGATE,P_SPINQ(e),XS(H)::B(J),XQ(e)
    • B(c);N_GUARD::QAR2(C)
  • Tries
    • Try
      • S(H);CHECK,N_SPINS(F)
      • Vars
        • Q(e);CHECK,N_GUARD,P_SPINQ(e)::R(I)+S(F),XQ(e)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR2(C)
      • Refutation
        • S(b);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR2(C)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XS(F)::R1(I),XQ(e)
      • Q(e);CHECK,N_GUARD,N_PINS(F)::QAB1(C),XQ(e)
      • Q(e);CHECK,N_PINS(F),P_SPINQ(e),XS(H)::R(I)+S(F)
      • Q(e);N_GUARD,N_PINS(F)::QAB1(C)
      • B(c);::QAR1(C)
      • S(b);::QAB1(C)
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