MESON Chess Problem Database

Problem Display
PID: 198821 (2r1R3/8/3p4/1Q6/2q1N1K1/1B1k4/2NP1R2/8 w - - 0 1)

Hartong, Jan

American Chess Bulletin, 1921

2r1R3/8/3p4/1Q6/2q1N1K1/1B1k4/2NP1R2/8

#2

8 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxc4#
    • 1...Rb8
      • 2.Qxc4#
    • 1...Rd8
      • 2.Qxc4#
    • 1...Rxe8
      • 2.Qxc4#
  • Tries
    • 1.Qd5+?
      • 1...Qd4
        • 2.Se1#
        • 2.Sb4#
        • 2.Qxd4#
      • 1...Qxd5!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qf3#
      • 1...Qg8+
        • 2.Sg5#
      • 1...Qxe4+
        • 2.Qxe4#
      • 1...Qxb3
        • 2.Sxd6#
      • 1...Qxc2
        • 2.Qd5#
      • 1...Qe6
        • 2.Sc5#
      • 1...Qf7
        • 2.Sc5#
        • 2.Sf6#
      • 1...Qd4
        • 2.Se1#
      • 1...Qc5
        • 2.Sxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 4
  • Sets
    • R(d);N_GUARD::QAB1(G),XQ(b)
    • R(d);N_GUARD,XR(H)::QAB1(G),XQ(b)
  • Tries
    • Try
      • Q(G);CHECK,N_PINQ(b)
      • Refutation
        • Q(b);N_PINS(E),XQ(G)
  • Actual
    • Q(G);N_PINQ(b)
    • Threat
      • QAR2(G)
    • Vars
      • Q(b);CHECK,N_PINS(E)::QAB(G)+S(E)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(E)::QAB1(G),XQ(b)
      • Q(b);N_PINS(E),XB(D)::QAB(G)+S(E),XP(c)
      • Q(b);N_GUARD,N_PINS(E),XS(A)::QAR2(G)
      • Q(b);N_PINS(E),P_PINQ(G)::QAB(G)+S(E),DCHECK
      • Q(b);SBLOCK::S(A)
      • Q(b);N_PINS(E)::QAB(G)+S(E),DCHECK,XQ(b)
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