MESON Chess Problem Database

Problem Display
PID: 21491 (8/3p1n2/NR1b3q/3k1ppb/7r/3P2p1/1BNR4/2K1QB2 w - - 0 1)

Roura, Juan R

Good Companions (December), 1919

8/3p1n2/NR1b3q/3k1ppb/7r/3P2p1/1BNR4/2K1QB2

#2

9 + 10

3132 The Good Companion Two-Mover 1922
23 Die Schwalbe 2001
5459 Sachmatija 2002
145 StrateGems 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.dxc4#
    • 1...Ba3
      • 2.Se3#
    • 1...Bb4
      • 2.Se3#
    • 1...Bf4
      • 2.Scb4#
    • 1...Bc5
      • 2.Sc7#
    • 1...Be5
      • 2.Se3#
    • 1...Bc7
      • 2.Se3#
    • 1...Be7
      • 2.Se3#
    • 1...Bb8
      • 2.Se3#
    • 1...Bf8
      • 2.Se3#
    • 1...f4
      • 2.Qe4#
    • 1...g4
      • 2.Bg2#
  • Tries
    • 1.Qe5+?
      • 1...Bxe5
        • 2.Se3#
      • 1...Sxe5!
    • 1.Qe7?
      • threat
        • 2.Se3#
      • 1...Rc4
        • 2.dxc4#
      • 1...Re4
        • 2.dxe4#
      • 1...Bf4
        • 2.Scb4#
        • 2.Sab4#
        • 2.Qc5#
      • 1...Bc5
        • 2.Sc7#
        • 2.Qxc5#
      • 1...f4
        • 2.Qe4#
      • 1...g4
        • 2.Bg2#
      • 1...Qe6!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Se3#
      • 1...Qe6
        • 2.Qa8#
      • 1...Rc4
        • 2.dxc4#
      • 1...Re4
        • 2.dxe4#
      • 1...Bf4
        • 2.Scb4#
      • 1...Bc5
        • 2.Sc7#
      • 1...f4
        • 2.Qe4#
      • 1...g4
        • 2.Bg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • R(b);OGATE,P_PINS(E)::R(F)+P(G)DCHECK,XR(b)
    • B(g);P_PINB(D)::S(E)
    • B(g);::S(E)
    • B(g);N_GUARD,P_PINR(F),S_CUTR(b)::S(E)
    • B(g);N_GUARD,SBLOCK::S(H)
    • P(d);N_GUARD,S_CUTR(b)::QAB1(B)
    • P(e);P_PINR(F),S_CUTB(f),S_CUTR(b)::B(C)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • B(g);XQ(B)::S(E)
      • Refutation
        • S(j);XQ(B)
    • Try
      • Q(B);
      • Threat
        • S(E)
      • Vars
        • R(b);OGATE,P_PINS(E)::R(F)+P(G)DCHECK,XR(b)
        • R(b);OGATE::R(F)+P(G)DCHECK,XR(b)
        • P(d);N_GUARD,S_CUTR(b)::QAB1(B)
        • P(e);P_PINR(F),S_CUTB(f),S_CUTR(b)::B(C)
      • Refutation
        • Q(h);
  • Actual
    • Q(B);
    • Threat
      • S(E)
    • Vars
      • Q(h);SBLOCK::QAB(B)
      • R(b);OGATE,P_PINS(E)::R(F)+P(G)DCHECK,XR(b)
      • R(b);OGATE::R(F)+P(G)DCHECK,XR(b)
      • B(g);N_GUARD,P_PINR(F),S_CUTR(b)::S(E)
      • B(g);N_GUARD,SBLOCK::S(H)
      • P(d);N_GUARD,S_CUTR(b)::QAB1(B)
      • P(e);P_PINR(F),S_CUTB(f),S_CUTR(b)::B(C)
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