MESON Chess Problem Database

Problem Display
PID: 172288 (8/n2R4/8/1nQ5/k7/3K4/1P6/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

8/n2R4/8/1nQ5/k7/3K4/1P6/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Rxa7#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Qb4#
      • 1...Sa3+
        • 2.Qxa3#
      • 1...Ka5
        • 2.Rxa7#
      • 1...Sc6
        • 2.Qxb5#
      • 1...Sd6+!
    • 1.Rxa7+?
      • 1...Kb3
        • 2.Qxb5#
      • 1...Sxa7!
    • 1.b3+?
      • 1...Ka5
        • 2.Rxa7#
      • 1...Kxb3!
  • Keys
    • 1.Rb7!
      • 1...Kb3
        • 2.Qa3#
      • 1...Ka5
        • 2.Rxa7#
      • 1...Sa3
        • 2.Rb4#
        • 2.Qxa3#
        • 2.Qb4#
        • 2.Qxa7#
        • 2.b3#
      • 1...Sc3
        • 2.Rb4#
        • 2.Qa3#
        • 2.Qb4#
        • 2.Qxa7#
        • 2.b3#
      • 1...Sd4
        • 2.Rb4#
        • 2.Qa3#
        • 2.Qb4#
        • 2.Qxa7#
      • 1...Sd6
        • 2.Rb4#
        • 2.Qa3#
        • 2.Qb4#
        • 2.Qxa7#
        • 2.b3#
      • 1...Sc7
        • 2.Rb4#
        • 2.Qa3#
        • 2.Qb4#
        • 2.b3#
      • 1...Sc6
        • 2.Qxb5#
      • 1...Sc8
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINS(b)::R(D),XS(c)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR1(C)
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(C),XS(b)
        • K(a);P-FLIGHT,P_SPINS(b)::R(D),XS(c)
        • S(c);N_GUARD::QAB1(C),XS(b)
      • Refutation
        • S(b);CHECK
    • Try
      • R(D);CHECK,XS(c)
      • Vars
        • K(a);S_FLIGHT::QAR2(C),XS(b)
      • Refutation
        • S(b);XR(D)
    • Try
      • P(A);CHECK
      • Vars
        • K(a);P-FLIGHT,P_SPINS(b)::R(D),XS(c)
      • Refutation
        • K(a);S_FLIGHT,XP(A)
  • Actual
    • R(D);
    • Vars
      • K(a);P_SPINS(b),S_FLIGHT::QAR1(C)
      • K(a);P-FLIGHT,P_SPINS(b)::R(D),XS(c)
      • S(c);N_GUARD::QAB1(C),XS(b)
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