MESON Chess Problem Database

Problem Display
PID: 203497 (2nQ4/8/pp6/kq3R2/b7/2K5/8/R4B2 w - - 0 1)

Nagy, Odon

Magyar Sakkvilag, 1924

2nQ4/8/pp6/kq3R2/b7/2K5/8/R4B2

#2

5 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5+
      • 2.Rxc5#
    • 1...Qd5
      • 2.Rxd5#
    • 1...Qe5+
      • 2.Rxe5#
  • Tries
    • 1.Bxb5?
      • threat
        • 2.Bf1#
        • 2.Be2#
        • 2.Bd3#
        • 2.Bxa4#
        • 2.Bc4#
        • 2.Bc6#
        • 2.Bd7#
        • 2.Be8#
        • 2.Rxa4#
      • 1...Sd6
        • 2.Rxa4#
      • 1...Sa7
        • 2.Rxa4#
      • 1...Se7
        • 2.Rxa4#
      • 1...axb5!
    • 1.Qd4?
      • threat
        • 2.Rxa4#
        • 2.Qxa4#
        • 2.Qb4#
      • 1...Qe5
        • 2.Rxa4#
      • 1...Qc5+!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Kd4#
      • 1...Qc5+
        • 2.Kb2#
      • 1...Qe5+
        • 2.Kc4#
      • 1...Qd5
        • 2.Kb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,OGATEB::R(D),XQ(c)
    • Q(c);OGATEB::R(D),XQ(c)
  • Tries
    • Try
      • B(B);XQ(c)
      • Threat
        • DUALS(9)
      • Vars
        • S(f);::R1(A),XB(a)
      • Refutation
        • P(d);N_SPINP(e),P_SPINP(d),XB(B)
    • Try
      • Q(E);N_PINP(e)
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);P_PINQ(E)::R1(A),XB(a)
      • Refutation
        • Q(c);CHECK
  • Actual
    • Q(E);N_PINP(e)
    • Threat
      • QAB(E)+K(C)
    • Vars
      • Q(c);CHECK::QAB(E)+K(C)
      • Q(c);::QAB(E)+K(C)
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