MESON Chess Problem Database

Problem Display
PID: 134459 (8/8/8/2KN4/Q7/2N5/1kp5/b7 w - - 0 1)

Andreev, Aleksandr Grigorevich

200 Shakhmatni Zadachi, 1983

8/8/8/2KN4/Q7/2N5/1kp5/b7

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...c1Q
      • 2.Qa2#
    • 1...c1B
      • 2.Qa2#
    • 1...c1R
      • 2.Qa2#
  • Tries
    • 1.Qxc2+?
      • 1...Ka3
        • 2.Sb1#
        • 2.Sb5#
        • 2.Qa2#
      • 1...Kxc2!
    • 1.Qb5+?
      • 1...Ka3
        • 2.Qb4#
      • 1...Kc1!
    • 1.Qxa1+?
      • 1...Kb3
        • 2.Qa2#
      • 1...Kxa1!
  • Keys
    • 1.Se3!
      • 1...Kc1
        • 2.Qxc2#
      • 1...Kxc3
        • 2.Qxc2#
      • 1...c1Q
        • 2.Qb4#
      • 1...c1S
        • 2.Sed1#
      • 1...c1B
        • 2.Sed1#
        • 2.Qb4#
      • 1...c1R
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(c);P_PINS(A),SBLOCK::QAR1(B)
    • P(c);SBLOCK::QAR1(B)
  • Tries
    • Try
      • Q(B);CHECK,XP(c)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK,XB(a)
      • Vars
        • K(b);P-FLIGHT::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
  • Actual
    • S(D);
    • Vars
      • K(b);S_FLIGHT::QAR1(B),XP(c)
      • K(b);S_FLIGHT,XS(A)::QAR1(B),XP(c)
      • P(c);P_PINS(A),SBLOCK::QAR2(B)
      • P(c);N_GUARD,SBLOCK::S(D)
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