MESON Chess Problem Database

Problem Display
PID: 101450 (8/1b6/B1Q5/3R1K2/5N2/4pk1p/8/1n2B1n1 w - - 0 1)

Sparke, Arthur M

Good Companions, 1921

8/1b6/B1Q5/3R1K2/5N2/4pk1p/8/1n2B1n1

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxa6
      • 2.Rd1#
      • 2.Rd2#
      • 2.Rd3#
      • 2.Rd4#
      • 2.Ra5#
      • 2.Rb5#
      • 2.Rc5#
      • 2.Re5#
      • 2.Rd6#
      • 2.Rd7#
      • 2.Rd8#
    • 1...Bc8+
      • 2.Rd7#
    • 1...Se2
      • 2.Bxe2#
    • 1...e2
      • 2.Rd3#
  • Tries
    • 1.Sg2?
      • threat
        • 2.Sh4#
      • 1...Bc8+
        • 2.Rd7#
      • 1...Kxg2
        • 2.Rd2#
      • 1...Bxa6
        • 2.Rd2#
      • 1...e2
        • 2.Rd3#
      • 1...hxg2!
    • 1.Bxb7?
      • threat
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd3#
        • 2.Rd4#
        • 2.Ra5#
        • 2.Rb5#
        • 2.Rc5#
        • 2.Re5#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Rd8#
      • 1...e2
        • 2.Rd3#
        • 2.Re5#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Sc3!
    • 1.Qxb7?
      • threat
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd3#
        • 2.Rd4#
        • 2.Ra5#
        • 2.Rb5#
        • 2.Rc5#
        • 2.Re5#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Rd8#
      • 1...e2
        • 2.Rd3#
        • 2.Re5#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Sc3!
    • 1.Qe8?
      • threat
        • 2.Qh5#
        • 2.Qe4#
      • 1...Bxd5
        • 2.Qh5#
      • 1...Sd2
        • 2.Qh5#
      • 1...Sc3
        • 2.Qh5#
      • 1...e2
        • 2.Rd3#
        • 2.Qe4#
      • 1...Bc8+!
    • 1.Qg6?
      • threat
        • 2.Qh5#
        • 2.Qg3#
        • 2.Qg4#
      • 1...e2
        • 2.Rd3#
        • 2.Qg3#
      • 1...Se2
        • 2.Bxe2#
        • 2.Qh5#
        • 2.Qg4#
      • 1...Bc8+!
    • 1.Qh6?
      • threat
        • 2.Qh5#
      • 1...e2
        • 2.Rd3#
      • 1...Bc8+!
  • Keys
    • 1.Sg6!
      • threat
        • 2.Sh4#
      • 1...Bc8+
        • 2.Rd7#
      • 1...Kg2
        • 2.Rd2#
      • 1...Bxa6
        • 2.Rd2#
      • 1...e2
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(f);CHECK,N_GUARD::QAB(F)+R(C)
    • S(b);N_GUARD::B(E),XS(b)
    • P(c);::QAB(F)+R(C),DCHECK
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • B(f);CHECK,N_GUARD::QAB(F)+R(C)
        • K(d);S_FLIGHT,XS(B)::QAB(F)+R(C),DCHECK
        • B(f);N_GUARD,XB(E)::QAB(F)+R(C)
        • P(c);SBLOCK::QAB(F)+R(C),DCHECK
      • Refutation
        • P(e);XS(B)
    • Try
      • B(E);XB(f)
      • Threat
        • DUALS(11)
      • Vars
        • S(a);::QAB(F)+R(C),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(F);XB(f)
      • Threat
        • DUALS(11)
      • Vars
        • S(a);::QAB(F)+R(C),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);XR(C)::QAB(F)
        • S(a);::QAB(F)
      • Refutation
        • B(f);CHECK
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Refutation
        • B(f);CHECK
    • Try
      • Q(F);
      • Threat
        • QAB(F)
      • Vars
        • P(c);OGATEB::R(C)
      • Refutation
        • B(f);CHECK
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • B(f);CHECK,N_GUARD::QAB(F)+R(C)
      • K(d);S_FLIGHT::QAB(F)+R(C),DCHECK
      • B(f);N_GUARD,XB(E)::QAB(F)+R(C)
      • P(c);SBLOCK::QAB(F)+R(C),DCHECK
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