MESON Chess Problem Database

Problem Display
PID: 101306 (4RQ2/8/8/8/6p1/K4b1q/6p1/2RNBkr1 w - - 0 1)

Bottacchi, Antonio

3rd Prize, Good Companions (February), 1919

4RQ2/8/8/8/6p1/K4b1q/6p1/2RNBkr1

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.Qxf3#
  • Tries
    • 1.Sb2?
      • threat
        • 2.Bg3#
        • 2.Bh4#
      • 1...Qg3
        • 2.Bxg3#
      • 1...Qh4
        • 2.Bg3#
        • 2.Bxh4#
      • 1...g3
        • 2.Bxg3#
        • 2.Qxf3#
      • 1...Qh6!
    • 1.Sc3?
      • threat
        • 2.Bg3#
        • 2.Bh4#
      • 1...Qg3
        • 2.Bxg3#
      • 1...Qh4
        • 2.Bg3#
        • 2.Bxh4#
      • 1...g3
        • 2.Bxg3#
        • 2.Qxf3#
      • 1...Qh6!
    • 1.Bg3?
      • threat
        • 2.Sb2#
        • 2.Sc3#
        • 2.Re1#
      • 1...Qh6
        • 2.Re1#
      • 1...Qxg3!
  • Keys
    • 1.Bf2!
      • threat
        • 2.Re1#
      • 1...Bxd1+
        • 2.Bg3#
      • 1...Be2+
        • 2.Se3#
      • 1...Be4+
        • 2.Sc3#
      • 1...Bd5+
        • 2.Sc3#
      • 1...Bc6+
        • 2.Sc3#
      • 1...Bb7+
        • 2.Sc3#
      • 1...Ba8+
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • P(f);N_GUARD,S_CUTQ(e)::QAR2(F),XB(d)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);::R(A)+B(C),XQ(e)
      • Refutation
        • Q(e);
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);::R(A)+B(C),XQ(e)
      • Refutation
        • Q(e);
    • Try
      • B(C);
      • Threat
        • DUALS(3)
      • Vars
        • Q(e);::R1(E)
      • Refutation
        • Q(e);XB(C)
  • Actual
    • B(C);N_PINB(d)
    • Threat
      • R1(E)
    • Vars
      • B(d);CHECK,OGATEB,P_SPINB(d),XS(B)::QAR(F)+B(C)
      • B(d);CHECK,SBLOCK::R(A)+S(B),DCHECK
      • B(d);CHECK,N_GUARD::R(A)+S(B)
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