MESON Chess Problem Database

Problem Display
PID: 64741 (n2b4/q4n2/2P5/RB1k1P1K/1Q2R3/8/8/8 w - - 0 1)

Rothstein, Louis

1st Prize, Good Companions (July Meredith Ty.), 1921

n2b4/q4n2/2P5/RB1k1P1K/1Q2R3/8/8/8

#2

7 + 5

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qb8
      • 2.Qd4#
    • 1...Qxa5
      • 2.Qd4#
    • 1...Qa6
      • 2.Qd4#
    • 1...Qb7
      • 2.Qd4#
    • 1...Qc7
      • 2.Qd4#
    • 1...Qd7
      • 2.Qd4#
    • 1...Qe7
      • 2.Qd4#
    • 1...Sb6
      • 2.Qd4#
  • Tries
    • 1.Ba4+?
      • 1...Qc5
        • 2.Qd4#
      • 1...Qxa5
        • 2.Qd4#
      • 1...Bxa5!
    • 1.Qd2+?
      • 1...Kc5
        • 2.Qd4#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Kxe4!
  • Keys
    • 1.Re6!
      • threat
        • 2.Qc4#
      • 1...Qc5
        • 2.Qe4#
      • 1...Qd4
        • 2.Bc4#
      • 1...Se5
        • 2.Rd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sb6
        • 2.Ba6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAR1(A),XQ(b)
    • Q(b);N_GUARD::QAR1(A)
    • Q(b);N_GUARD,XR(C)::QAR1(A)
    • S(d);S_CUTQ(b)::QAR1(A)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • Q(b);P_SPINQ(b)::QAR1(A)
        • Q(b);XR(C)::QAR1(A)
      • Refutation
        • B(e);XR(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(A)
        • Q(b);N_GUARD,P_SPINQ(b)::QAR1(A),XQ(b)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
  • Actual
    • R(B);
    • Threat
      • QAB1(A)
    • Vars
      • Q(b);SBLOCK::QAB1(A)
      • Q(b);SBLOCK::R(C)+B(D),DCHECK
      • S(c);N_GUARD,SBLOCK::R1(B)
      • S(c);N_GUARD::QAR1(A),XS(c)
      • S(d);S_CUTB(e),S_CUTQ(b)::R(C)+B(D)
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