MESON Chess Problem Database

Problem Display
PID: 157317 (4N1kr/4K1p1/7P/8/7Q/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

200 Shakhmatni Zadachi, 1983

4N1kr/4K1p1/7P/8/7Q/8/8/8

#2

4 + 3

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Sf6#
    • 1...g6
      • 2.Sf6#
  • Tries
    • 1.Qg3?
      • threat
        • 2.Sf6#
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...Rxh6
        • 2.Qxg7#
      • 1...g5
        • 2.Sf6#
      • 1...g6
        • 2.Sf6#
        • 2.Qxg6#
      • 1...Rh7!
    • 1.Qg5?
      • threat
        • 2.Sf6#
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...Rxh6
        • 2.Qxg7#
      • 1...g6
        • 2.Sf6#
        • 2.Qxg6#
      • 1...Rh7!
    • 1.Qd4?
      • threat
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...gxh6
        • 2.Qg7#
      • 1...g5
        • 2.Sf6#
        • 2.Qg7#
      • 1...g6
        • 2.Sf6#
        • 2.Qg7#
      • 1...Rh7!
    • 1.Qg4?
      • threat
        • 2.Sf6#
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...Rxh6
        • 2.Qxg7#
      • 1...g5
        • 2.Sf6#
      • 1...g6
        • 2.Sf6#
        • 2.Qxg6#
      • 1...Rh7!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...gxf6
        • 2.Sxf6#
      • 1...gxh6
        • 2.Qg7#
        • 2.Qg6#
        • 2.Qf7#
      • 1...Rh7
        • 2.Qf8#
      • 1...g5
        • 2.Qg7#
        • 2.Qg6#
        • 2.Qf7#
      • 1...g6
        • 2.Qg7#
        • 2.Qxg6#
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(a);N_GUARD::S(D)
  • Tries
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAR1(A),XP(a)
        • R(c);XP(B)::QAR1(A),XP(a)
        • P(a);::S(D)
      • Refutation
        • R(c);
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAR1(A),XP(a)
        • R(c);XP(B)::QAR1(A),XP(a)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(a)
      • Vars
        • K(b);S_FLIGHT::QAR1(A),XP(a)
        • P(a);XP(B)::QAR1(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAR1(A),XP(a)
        • R(c);XP(B)::QAR1(A),XP(a)
        • P(a);::S(D)
      • Refutation
        • R(c);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XP(a)
    • Vars
      • K(b);S_FLIGHT::QAR1(A),XP(a)
      • P(a);XQ(A)::S(D),XP(a)
      • R(c);SBLOCK::QAR1(A)
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