MESON Chess Problem Database

Problem Display
PID: 259208 (K7/Nn6/2p5/1r6/kPQ5/7R/8/3b4 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

Skakbladet, 1984

K7/Nn6/2p5/1r6/kPQ5/7R/8/3b4

#2

5 + 5

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb4
      • 2.Qa2#
    • 1...Ra5
      • 2.b5#
    • 1...Be2
      • 2.Qb3#
    • 1...Bb3
      • 2.Qxb3#
    • 1...Bg4
      • 2.Qb3#
    • 1...Bh5
      • 2.Qb3#
    • 1...c5
      • 2.Qxb5#
  • Tries
    • 1.Qc2+?
      • 1...Kxb4
        • 2.Sxc6#
      • 1...Bxc2!
    • 1.Qc3?
      • threat
        • 2.Qa3#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bf3!
  • Keys
    • 1.Sxc6!
      • threat
        • 2.Qa2#
      • 1...Ra5+
        • 2.bxa5#
      • 1...Rxb4
        • 2.Qxb4#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Rc5
        • 2.bxc5#
      • 1...Rd5
        • 2.b5#
      • 1...Re5
        • 2.b5#
      • 1...Rf5
        • 2.b5#
      • 1...Rg5
        • 2.b5#
      • 1...Rh5
        • 2.b5#
      • 1...Rb6
        • 2.b5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 4
  • Sets
    • R(c);P_SPINR(c),SBLOCK,XP(B)::QAR2(C)
    • R(c);OGATE,P_PINS(D),SBLOCK::QAR(C)+P(B)
    • B(a);N_GUARD::QAB1(C)
    • B(a);N_GUARD::QAB1(C),XB(a)
    • P(d);N_GUARD::QAB1(C),XR(c)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT,S_CUTB(a),XP(B)::S(D),XP(d)
      • Refutation
        • B(a);XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • B(a);N_GUARD::QAB1(C),XB(a)
      • Refutation
        • B(a);
  • Actual
    • S(D);XP(d)
    • Threat
      • QAR2(C)
    • Vars
      • R(c);CHECK,OGATE::QAR(C)+P(B),XR(c)
      • R(c);OGATE,P_SPINR(c),XP(B)::QAR1(C),XR(c)
      • B(a);N_GUARD::QAB1(C),XB(a)
      • R(c);OGATE::QAR(C)+P(B),XR(c)
      • R(c);OGATE::QAR(C)+P(B)
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