MESON Chess Problem Database

Problem Display
PID: 172394 (8/2K5/kp6/b7/1R1Q4/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

8/2K5/kp6/b7/1R1Q4/8/8/8

#2

3 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb4
      • 2.Qxb6#
  • Tries
    • 1.Kb8?
      • 1...b5
        • 2.Qa7#
      • 1...Bxb4!
    • 1.Rb5?
      • 1...Ka7
        • 2.Rxa5#
      • 1...Be1
        • 2.Qxb6#
      • 1...Bd2
        • 2.Qxb6#
      • 1...Bc3
        • 2.Qxb6#
      • 1...Bb4
        • 2.Qxb6#
      • 1...Kxb5!
    • 1.Rxb6+?
      • 1...Bxb6+
        • 2.Qxb6#
      • 1...Ka7!
    • 1.Qf6?
      • 1...Bxb4
        • 2.Qxb6#
      • 1...Ka7!
    • 1.Qd6?
      • 1...Bxb4
        • 2.Qxb6#
      • 1...Ka7!
  • Keys
    • 1.Ra4!
      • threat
        • 2.Qxb6#
      • 1...b5+
        • 2.Qb6#
      • 1...Kb5
        • 2.Qc4#
      • 1...Ka7
        • 2.Rxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD,XR(A)::QAR1(B),XP(c)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Vars
        • P(c);OGATE::QAR1(B)
      • Refutation
        • B(a);XR(A)
    • Try
      • R(A);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::R(A),XB(a)
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT,XR(A)
    • Try
      • R(A);CHECK,P_SPINR(A),XP(c)
      • Vars
        • B(a);CHECK,OGATE,XR(A)::QAR1(B),XB(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);P_PINP(c)
      • Vars
        • B(a);N_GUARD,XR(A)::QAR1(B),XP(c)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • Q(B);P_PINP(c)
      • Vars
        • B(a);N_GUARD,XR(A)::QAR1(B),XP(c)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
  • Actual
    • R(A);P_PINB(a)
    • Threat
      • QAR1(B),XP(c)
    • Vars
      • P(c);CHECK::QAR1(B)
      • K(b);N_SPINB(a),S_FLIGHT::QAB1(B)
      • K(b);P-FLIGHT,P_SPINP(c)::R(A),XB(a)
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