MESON Chess Problem Database

Problem Display
PID: 21695 (8/8/8/8/2NK1R2/1Q1p3B/N2pkp2/2r1nR1n w - - 0 1)

Janet, Frank

Good Companions (May), 1920

8/8/8/8/2NK1R2/1Q1p3B/N2pkp2/2r1nR1n

#2

7 + 7

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sc3#
    • 1...Rb1
      • 2.Sc3#
    • 1...Rd1
      • 2.Sc3#
    • 1...Rc3
      • 2.Sxc3#
    • 1...Sg2
      • 2.Qxd3#
    • 1...Sg3
      • 2.R1xf2#
      • 2.R4xf2#
    • 1...d1S
      • 2.Sxc1#
    • 1...d1B
      • 2.Sxc1#
  • Tries
    • 1.Qd1+?
      • 1...Rxd1
        • 2.Sc3#
      • 1...Kxd1!
    • 1.Qxd3+?
      • 1...Kd1
        • 2.Sb2#
        • 2.Se3#
        • 2.Bg4#
        • 2.Qxd2#
      • 1...Sxd3!
  • Keys
    • 1.Rxe1+!
      • 1...Kxe1
        • 2.Re4#
      • 1...Rxe1
        • 2.Sc3#
      • 1...dxe1Q
        • 2.Qxd3#
      • 1...dxe1S
        • 2.Sxc1#
      • 1...dxe1B
        • 2.Sxc1#
        • 2.Qxd3#
      • 1...dxe1R
        • 2.Qxd3#
      • 1...fxe1Q
        • 2.Bg4#
      • 1...fxe1S
        • 2.Bf1#
      • 1...fxe1B
        • 2.Bf1#
        • 2.Bg4#
      • 1...fxe1R
        • 2.Bg4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::S(B)
    • R(a);N_GUARD::S(B),XR(a)
    • S(b);N_GUARD::QAB1(C),XP(g)
    • P(d);N_GUARD::S(B),XR(a)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • R(a);XQ(C)::S(B)
      • Refutation
        • K(e);P_SPINS(b),S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,XP(g)
      • Refutation
        • S(b);XQ(C)
  • Actual
    • R(A);CHECK,XS(b)
    • Vars
      • K(e);P-FLIGHT,XR(A)::R(G)
      • R(a);SBLOCK,XR(A)::S(B)
      • P(d);SBLOCK,XR(A)::QAB1(C),XP(g)
      • P(d);SBLOCK,XR(A)::S(B),XR(a)
      • P(f);SBLOCK,XR(A)::B(D)
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