MESON Chess Problem Database

Problem Display
PID: 175006 (2R5/5pq1/8/1pN5/3kpP2/6p1/QN6/4R1Kb w - - 0 1)

McAllister, George W

Philadelphia Times, 1901

2R5/5pq1/8/1pN5/3kpP2/6p1/QN6/4R1Kb

#2

7 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Qc4#
    • 1...f5
      • 2.Se6#
    • 1...f6
      • 2.Se6#
  • Tries
    • 1.Rd1+?
      • 1...Kc3
        • 2.Sa6#
        • 2.Qb3#
      • 1...Ke3!
    • 1.Rxe4+?
      • 1...Kc3
        • 2.Sd1#
        • 2.Sb3#
      • 1...Bxe4!
    • 1.Rd8+?
      • 1...Kc3
        • 2.Qb3#
      • 1...Kxc5!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qd2#
      • 1...Kd5
        • 2.Qd8#
      • 1...b4
        • 2.Sb3#
      • 1...e3
        • 2.Rd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • P(e);N_GUARD::QAR1(C)
    • P(f);N_GUARD::S(F)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(A);CHECK,XP(d)
      • Refutation
        • B(a);XR(A)
    • Try
      • R(G);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT,XS(F)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(c);P-FLIGHT::QAR(C)
      • P(e);::S(F)
      • P(d);SBLOCK::R(A)
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