MESON Chess Problem Database

Problem Display
PID: 250738 (4b3/b1B2B2/5pq1/Qpk3r1/Pp1p1N2/1P6/1KP2R2/8 w - - 0 1)

Mason, P

Manchester Evening News, 1939

(First published on Mon Feb 13 1939)

4b3/b1B2B2/5pq1/Qpk3r1/Pp1p1N2/1P6/1KP2R2/8

#2

9 + 9

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2+
      • 2.Rxc2#
    • 1...Bb6
      • 2.Qxb6#
    • 1...Bb8
      • 2.Qb6#
    • 1...Bc6
      • 2.Qxa7#
    • 1...Bxf7
      • 2.Qxb5#
  • Tries
    • 1.Bd6+?
      • 1...Kc6
        • 2.Qc7#
      • 1...Kxd6!
    • 1.Bxe8?
      • threat
        • 2.Qxb5#
        • 2.Qxa7#
      • 1...Qxc2+
        • 2.Rxc2#
      • 1...d3
        • 2.Qxa7#
      • 1...Qd3
        • 2.Qxa7#
      • 1...Bb6
        • 2.Qxb6#
        • 2.Qxb5#
      • 1...Bb8
        • 2.Qb6#
        • 2.Qxb5#
      • 1...f5
        • 2.Qxb5#
      • 1...Qxe8!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Bd6#
        • 2.Qd6#
      • 1...Qxc2+
        • 2.Rxc2#
      • 1...bxa4
        • 2.Bd6#
        • 2.Qc4#
      • 1...Bb6
        • 2.Qxb6#
      • 1...d3
        • 2.Qd6#
      • 1...Rd5
        • 2.Se6#
      • 1...Bb8
        • 2.Qb6#
        • 2.Qd6#
      • 1...Bc6
        • 2.Qxa7#
      • 1...f5
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(g);CHECK,OGATE,XP(B)::R(C),XQ(g)
    • B(h);N_GUARD::QAB1(G),XB(h)
    • B(h);N_GUARD::QAB1(G)
    • B(i);SBLOCK::QAB(G),XB(h)
    • B(i);N_GUARD,XB(I)::QAR1(G),XP(c)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • K(d);N_SPINP(c),P-FLIGHT::QAR1(G)
      • Refutation
        • K(d);N_SPINP(c),S_FLIGHT,XB(H)
    • Try
      • B(I);XB(i)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);CHECK,OGATE,XP(B)::R(C),XQ(g)
        • P(b);::QAB(G),XB(h)
        • Q(g);::QAB(G),XB(h)
        • P(f);::QAR1(G),XP(c)
      • Refutation
        • Q(g);XB(I)
  • Actual
    • Q(G);N_PINP(c)
    • Threat
      • DUALS(2)
    • Vars
      • Q(g);CHECK,OGATE,XP(B)::R(C),XQ(g)
      • B(h);N_GUARD::QAB1(G),XB(h)
      • P(b);::QAB1(G)
      • R(e);SBLOCK::S(F)
      • B(i);SBLOCK::QAB(G),XB(h)
      • P(f);S_CUTQ(g)::S(F)
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