MESON Chess Problem Database

Problem Display
PID: 175482 (6b1/R3R3/1pk4n/5n2/1PppP3/B4Q2/2N5/5BK1 w - - 0 1)

McAllister, George W

Philadelphia Times, 1899

6b1/R3R3/1pk4n/5n2/1PppP3/B4Q2/2N5/5BK1

#2

9 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.b5#
      • 2.e5#
    • 1...Sd6
      • 2.Sxd4#
    • 1...c3
      • 2.b5#
    • 1...b5
      • 2.Ra6#
  • Tries
    • 1.Sxd4+?
      • 1...Kd6
        • 2.Rad7#
        • 2.Qf4#
        • 2.b5#
        • 2.e5#
      • 1...Sxd4!
    • 1.Bxc4?
      • threat
        • 2.b5#
      • 1...Kd6
        • 2.b5#
        • 2.e5#
      • 1...b5
        • 2.Ra6#
      • 1...Sd6
        • 2.Sxd4#
        • 2.Rac7#
        • 2.Rec7#
      • 1...Bxc4!
    • 1.Rac7+?
      • 1...Kd6
        • 2.Qf4#
        • 2.b5#
        • 2.e5#
      • 1...Kb5!
    • 1.Qxf5?
      • threat
        • 2.Qd7#
        • 2.b5#
      • 1...Kd6
        • 2.Qd7#
        • 2.b5#
      • 1...Bd5
        • 2.Qd7#
        • 2.Qxd5#
      • 1...b5
        • 2.Ra6#
        • 2.Qc5#
      • 1...Be6
        • 2.Rxe6#
        • 2.b5#
      • 1...Sxf5!
    • 1.exf5+?
      • 1...Kb5
        • 2.Sxd4#
      • 1...Kd6
        • 2.Rad7#
        • 2.b5#
      • 1...Bd5!
  • Keys
    • 1.Qb3!
      • threat
        • 2.b5#
      • 1...Kb5
        • 2.Qa4#
      • 1...Kd6
        • 2.b5#
      • 1...Sd6
        • 2.Sxd4#
      • 1...b5
        • 2.Ra6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(c);N_GUARD,SBLOCK::S(C),XP(b)
    • P(a);::P(F)
    • P(d);OGATEB,SBLOCK::R(H)
  • Tries
    • Try
      • S(C);CHECK,XP(b)
      • Refutation
        • S(c);XS(C)
    • Try
      • B(A);XP(a)
      • Threat
        • P(F)
      • Vars
        • P(d);OGATEB::R(H)
      • Refutation
        • B(g);XB(A)
    • Try
      • R(H);CHECK
      • Refutation
        • K(e);P_SPINP(a),S_FLIGHT
    • Try
      • Q(E);XS(c)
      • Threat
        • DUALS(2)
      • Refutation
        • S(f);XQ(E)
    • Try
      • P(G);CHECK,XS(c)
      • Vars
        • K(e);P_SPINP(a),S_FLIGHT::S(C),XP(b)
      • Refutation
        • B(g);P_SPINB(g)
  • Actual
    • Q(E);
    • Threat
      • P(F)
    • Vars
      • K(e);P_SPINP(a),S_FLIGHT::QAB1(E)
      • K(e);P-FLIGHT::B(D)+P(F)
      • S(c);N_GUARD,SBLOCK::S(C),XP(b)
      • P(d);OGATEB,SBLOCK::R(H)
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