MESON Chess Problem Database

Problem Display
PID: 101461 (8/Q7/7B/2P1pK1B/b7/8/2P1R2b/3k4 w - - 0 1)

Stubbs, Arthur Goodwin

Good Companions, 1921

8/Q7/7B/2P1pK1B/b7/8/2P1R2b/3k4

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc2+
      • 2.Re4#
    • 1...Bb3
      • 2.Qa1#
    • 1...Bb5
      • 2.Qa1#
    • 1...Bc6
      • 2.Qa1#
    • 1...Bd7+
      • 2.Qxd7#
    • 1...Be8
      • 2.Qa1#
  • Tries
    • 1.Qxa4?
      • threat
        • 2.Re4#
        • 2.Rxe5#
        • 2.Qd7#
        • 2.Qa1#
        • 2.c3#
        • 2.c4#
      • 1...Bg1
        • 2.Re4#
        • 2.Rxe5#
        • 2.Qa1#
        • 2.c3#
        • 2.c4#
      • 1...e4
        • 2.Rxe4#
        • 2.Qa1#
        • 2.Qd4#
        • 2.c3#
        • 2.c4#
      • 1...Bf4!
    • 1.Qa5?
      • threat
        • 2.Rf2#
        • 2.Rg2#
        • 2.Rxh2#
        • 2.Qe1#
        • 2.Qd2#
      • 1...Bxc2+
        • 2.Re4#
      • 1...Bf4
        • 2.Qe1#
      • 1...Bg1
        • 2.Rf2#
        • 2.Rg2#
        • 2.Rh2#
        • 2.Qe1#
        • 2.Qd2#
      • 1...Bg3
        • 2.Rf2#
        • 2.Rg2#
        • 2.Rh2#
        • 2.Qd2#
      • 1...Bb5
        • 2.Qe1#
        • 2.Qd2#
        • 2.Qa1#
      • 1...Bc6
        • 2.Qe1#
        • 2.Qd2#
        • 2.Qa1#
      • 1...Be8
        • 2.Qe1#
        • 2.Qd2#
        • 2.Qa1#
      • 1...Bd7+!
    • 1.c3?
      • threat
        • 2.Qxa4#
      • 1...Bc2+
        • 2.Re4#
      • 1...Bd7+
        • 2.Qxd7#
      • 1...Bb3
        • 2.Qa1#
      • 1...Bb5
        • 2.Qa1#
      • 1...Bc6
        • 2.Qa1#
      • 1...Be8
        • 2.Qa1#
      • 1...Bf4!
    • 1.c4?
      • threat
        • 2.Qxa4#
      • 1...Bc2+
        • 2.Re4#
      • 1...Bd7+
        • 2.Qxd7#
      • 1...Bb3
        • 2.Qa1#
        • 2.Qd7#
      • 1...Bb5
        • 2.Qa1#
      • 1...Bc6
        • 2.Qa1#
      • 1...Be8
        • 2.Qa1#
      • 1...Bf4!
  • Keys
    • 1.c6!
      • threat
        • 2.Qd7#
      • 1...Bxc2+
        • 2.Re4#
      • 1...Bxc6
        • 2.Qa1#
      • 1...Bf4
        • 2.Qg1#
      • 1...Bg1
        • 2.Qxg1#
      • 1...Bb3
        • 2.Qa1#
      • 1...Bb5
        • 2.Qa1#
      • 1...e4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(c);CHECK,SBLOCK,XP(A)::B(E)+R(B)
    • B(c);OGATE::QAR(G)
    • B(c);CHECK,N_GUARD::QAR(G),XB(c)
  • Tries
    • Try
      • Q(G);XB(c)
      • Threat
        • DUALS(6)
      • Refutation
        • B(b);
    • Try
      • Q(G);
      • Threat
        • DUALS(5)
      • Vars
        • B(c);CHECK,SBLOCK,XP(A)::B(E)+R(B)
        • B(b);::QAR1(G)
      • Refutation
        • B(c);CHECK
    • Try
      • P(A);
      • Threat
        • QAB(G),XB(c)
      • Vars
        • B(c);CHECK,SBLOCK::B(E)+R(B)
        • B(c);CHECK,N_GUARD::QAR(G),XB(c)
        • B(c);OGATE::QAR(G)
      • Refutation
        • B(b);
    • Try
      • P(A);
      • Threat
        • QAB(G),XB(c)
      • Vars
        • B(c);CHECK,SBLOCK::B(E)+R(B)
        • B(c);CHECK,N_GUARD::QAR(G),XB(c)
        • B(c);OGATE::QAR(G)
      • Refutation
        • B(b);
  • Actual
    • P(C);
    • Threat
      • QAR(G)
    • Vars
      • B(c);CHECK,SBLOCK,XP(A)::B(E)+R(B)
      • B(c);OGATE,XP(C)::QAR(G)
      • B(b);N_GUARD::QAR(G)
      • B(b);N_GUARD::QAR(G),XB(b)
      • B(c);OGATE::QAR(G)
      • P(d);N_GUARD::QAR(G)
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