MESON Chess Problem Database

Problem Display
PID: 187565 (qnB5/3p4/1p1P1N2/1k6/p3p3/K3Bp2/1PQ2P2/8 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1936

(First published on Sun Feb 2 1936)

qnB5/3p4/1p1P1N2/1k6/p3p3/K3Bp2/1PQ2P2/8

#2

8 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Qxa4#
    • 1...Qd5
      • 2.Qxa4#
    • 1...Qc6
      • 2.Qxa4#
    • 1...Qb7
      • 2.Qxa4#
    • 1...Sa6
      • 2.Qxa4#
  • Tries
    • 1.Qb3+?
      • 1...Ka5
        • 2.Bd2#
        • 2.Bxb6#
        • 2.Qxa4#
        • 2.Qb4#
        • 2.Qxb6#
      • 1...Kc6
        • 2.Qd5#
        • 2.Qxb6#
      • 1...axb3+!
    • 1.Qd3+?
      • 1...Ka5
        • 2.Bd2#
      • 1...Kc6
        • 2.Qd5#
      • 1...exd3!
    • 1.Qxe4?
      • 1...Ka5
        • 2.Qxa4#
        • 2.Qb4#
      • 1...Qd5
        • 2.Qxd5#
        • 2.Qxa4#
      • 1...Qb7
        • 2.Qxa4#
      • 1...Qa5
        • 2.Qd5#
      • 1...Qc6
        • 2.Qxa4#
        • 2.Qb4#
      • 1...Qa6
        • 2.Qd5#
      • 1...Qa7
        • 2.Qd5#
      • 1...Sa6
        • 2.Qxa4#
      • 1...Sc6
        • 2.Qd5#
      • 1...Qxe4!
    • 1.Qc4+?
      • 1...Ka5
        • 2.Bd2#
        • 2.Qxa4#
        • 2.Qb4#
      • 1...Kxc4!
  • Keys
    • 1.Qd1!
      • 1...Kc4
        • 2.Qf1#
      • 1...Ka5
        • 2.Qxa4#
      • 1...Kc6
        • 2.Qd5#
      • 1...Qb7
        • 2.Qxa4#
      • 1...Qa5
        • 2.Qd5#
      • 1...Qd5
        • 2.Qxa4#
        • 2.Qxd5#
      • 1...Qc6
        • 2.Qxa4#
      • 1...Qa6
        • 2.Qd5#
      • 1...Qa7
        • 2.Qd5#
      • 1...Sa6
        • 2.Qxa4#
      • 1...Sc6
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • K(d);P-FLIGHT::QAR1(B),XP(b)
    • Q(g);N_GUARD::QAB1(B),XP(b)
    • Q(g);N_GUARD,SBLOCK::QAB1(B),XP(b)
    • S(h);S_CUTQ(g)::QAB1(B),XP(b)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • P(b);CHECK,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::B(E)
        • K(d);S_FLIGHT::QAB1(B)
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);XP(c)
      • Vars
        • Q(g);N_GUARD::QAB1(B),XP(b)
        • Q(g);N_GUARD,SBLOCK::QAR2(B)
        • Q(g);N_GUARD::QAR2(B)
        • S(h);S_CUTQ(g)::QAB1(B),XP(b)
        • S(h);S_CUTQ(g)::QAR2(B)
      • Refutation
        • Q(g);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(d);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(d);S_FLIGHT::QAB(B)
      • K(d);P-FLIGHT::QAR1(B),XP(b)
      • K(d);S_FLIGHT::QAB1(B)
      • Q(g);N_GUARD::QAB1(B),XP(b)
      • Q(g);N_GUARD,SBLOCK::QAR2(B)
      • Q(g);N_GUARD,SBLOCK::QAB1(B),XP(b)
      • Q(g);N_GUARD::QAR2(B)
      • S(h);S_CUTQ(g)::QAB1(B),XP(b)
      • S(h);S_CUTQ(g)::QAR2(B)
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