MESON Chess Problem Database

Problem Display
PID: 172528 (3r4/1P6/2k5/KR2Q3/8/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 2002

3r4/1P6/2k5/KR2Q3/8/8/8/8

#2

4 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.b8S#
    • 1...Rd2
      • 2.b8S#
    • 1...Rd3
      • 2.b8S#
    • 1...Rd4
      • 2.b8S#
    • 1...Rd5
      • 2.b8S#
    • 1...Rd7
      • 2.Rb6#
      • 2.Qc5#
      • 2.b8S#
    • 1...Rc8
      • 2.bxc8Q#
  • Tries
    • 1.Rc5+?
      • 1...Kd7
        • 2.Rc7#
      • 1...Kxb7!
    • 1.Qe6+?
      • 1...Rd6
        • 2.Qc8#
      • 1...Kc7!
    • 1.b8Q?
      • threat
        • 2.Qec7#
        • 2.Qbc7#
        • 2.Qb7#
      • 1...Kd7
        • 2.Qbc7#
        • 2.Qb7#
      • 1...Rd6
        • 2.Qexd6#
        • 2.Qbxd6#
        • 2.Qb7#
        • 2.Qc8#
      • 1...Rd7
        • 2.Rc5#
        • 2.Rb6#
        • 2.Qc3#
        • 2.Qc5#
        • 2.Qb6#
      • 1...Rc8
        • 2.Qed6#
        • 2.Qbd6#
        • 2.Qd5#
        • 2.Qe6#
        • 2.Qb7#
        • 2.Qxc8#
      • 1...Rxb8!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Rc5#
      • 1...Ra8+
        • 2.bxa8Q#
        • 2.bxa8B#
      • 1...Rd7
        • 2.Qc5#
      • 1...Rd5
        • 2.b8S#
      • 1...Rd6
        • 2.b8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(b);N_GUARD::P=S
    • R(b);N_GUARD,P_PINR(B)::P=S
    • R(b);OGATE::PXR(b)=Q
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::R1(B)
      • Refutation
        • K(a);S_FLIGHT,XP(D)
    • Try
      • Q(C);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b),SBLOCK::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(D);
      • Threat
        • DUALS(3)
      • Refutation
        • R(b);XQ(D)
  • Actual
    • Q(C);
    • Threat
      • R1(B)
    • Vars
      • R(b);CHECK,OGATE::PXR(b)=Q
      • R(b);SBLOCK::QAR1(C)
      • R(b);N_GUARD,P_PINR(B)::P=S
      • R(b);N_GUARD::P=S
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