MESON Chess Problem Database

Problem Display
PID: 157928 (4K3/4B3/4k3/4p3/4Q3/4n3/b7/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

200 Shakhmatni Zadachi, 1983

4K3/4B3/4k3/4p3/4Q3/4n3/b7/8

#2

3 + 4

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Qg6#
    • 1...Sd5
      • 2.Qg4#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qf7#
      • 1...e4
        • 2.Qxe4#
      • 1...Sf5!
    • 1.Qb7?
      • threat
        • 2.Qd7#
      • 1...e4
        • 2.Qxe4#
      • 1...Kf5!
    • 1.Qh7?
      • threat
        • 2.Qf7#
      • 1...e4
        • 2.Qxe4#
      • 1...Kd5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qd7#
      • 1...e4
        • 2.Qxe4#
      • 1...Bd5
        • 2.Qg6#
      • 1...Sd5
        • 2.Qh3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::QAR2(A)
    • S(b);N_GUARD,SBLOCK::QAB(A)
  • Tries
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR2(A),XP(c)
      • Refutation
        • S(b);
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR2(A),XP(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR2(A),XP(c)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(A);N_PINP(c)
    • Threat
      • QAB1(A)
    • Vars
      • P(c);OGATEB::QAR2(A),XP(c)
      • B(a);SBLOCK::QAR2(A)
      • S(b);OGATE,SBLOCK::QAB(A)
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