MESON Chess Problem Database

Problem Display
PID: 227841 (8/8/8/8/1p6/1K2Q3/2P5/1nBk4 w - - 0 1)

Kovacs, Norbert

Magyar Sakkvilag, 1926

8/8/8/8/1p6/1K2Q3/2P5/1nBk4

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2+
      • 2.Qxd2#
    • 1...Sa3
      • 2.Qd2#
    • 1...Sc3
      • 2.Qd2#
  • Tries
    • 1.Kb2?
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sa3
        • 2.Qd2#
      • 1...Sc3
        • 2.Qd2#
      • 1...b3!
    • 1.Kxb4?
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sa3
        • 2.Qd2#
      • 1...Sc3
        • 2.Qd2#
      • 1...Kxc2!
    • 1.Qe2+?
      • 1...Kxc1
        • 2.Qe1#
      • 1...Kxe2!
    • 1.c3?
      • 1...Sd2+
        • 2.Qxd2#
      • 1...Sxc3
        • 2.Qd2#
      • 1...Sa3
        • 2.Qd2#
      • 1...bxc3!
    • 1.c4?
      • 1...Sd2+
        • 2.Qxd2#
      • 1...Sa3
        • 2.Qd2#
      • 1...Sc3
        • 2.Qd2#
      • 1...bxc4 ep!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qf1#
      • 1...Sd2+
        • 2.Qxd2#
      • 1...Kxc1
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(a);CHECK,N_GUARD::QAR1(D),XS(a)
    • S(a);N_GUARD::QAR1(D)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAR1(D),XS(a)
        • S(a);N_GUARD::QAR1(D)
      • Refutation
        • P(c);
    • Try
      • K(C);P-FLIGHT,XP(c)
      • Vars
        • S(a);N_GUARD::QAR1(D),XS(a)
        • S(a);N_GUARD::QAR1(D)
      • Refutation
        • K(b);S_FLIGHT,XP(B)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT,XB(A)::QAR2(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(D)
    • Try
      • P(B);
      • Vars
        • S(a);CHECK,N_GUARD::QAR1(D),XS(a)
        • S(a);N_GUARD,XP(B)::QAR1(D)
        • S(a);N_GUARD::QAR1(D)
      • Refutation
        • P(c);XP(B)
    • Try
      • P(B);
      • Vars
        • S(a);CHECK,N_GUARD::QAR1(D),XS(a)
        • S(a);N_GUARD::QAR1(D)
      • Refutation
        • P(c);EP,XP(B)
  • Actual
    • Q(D);
    • Threat
      • QAR2(D)
    • Vars
      • S(a);CHECK,N_GUARD::QAR1(D),XS(a)
      • K(b);P-FLIGHT,XB(A)::QAR2(D)
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