MESON Chess Problem Database

Problem Display
PID: 232964 (1q6/2b5/8/2N5/8/k7/1R5Q/K7 w - - 0 1)

Kozhakin, Vladimir Vladimirovich

Lebedev, Danilo

Kudesnik, 1996

1q6/2b5/8/2N5/8/k7/1R5Q/K7

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Rb3#
    • 1...Qxb2+
      • 2.Qxb2#
    • 1...Qb3
      • 2.Rxb3#
    • 1...Qb4
      • 2.Ra2#
    • 1...Qa8
      • 2.Rb3#
    • 1...Qc8
      • 2.Rb3#
    • 1...Qd8
      • 2.Rb3#
    • 1...Qe8
      • 2.Rb3#
    • 1...Qf8
      • 2.Rb3#
    • 1...Bb6
      • 2.Rb3#
  • Tries
    • 1.Rxb8?
      • threat
        • 2.Rb3#
        • 2.Qa2#
        • 2.Qb2#
      • 1...Bxh2
        • 2.Rb3#
      • 1...Bxb8
        • 2.Qb2#
      • 1...Bb6
        • 2.Qb2#
      • 1...Be5+!
    • 1.Qg3+?
      • 1...Qb3
        • 2.Rxb3#
        • 2.Qxb3#
      • 1...Bxg3!
    • 1.Qc2?
      • threat
        • 2.Qa4#
      • 1...Qxb2+
        • 2.Qxb2#
      • 1...Qb3
        • 2.Rxb3#
        • 2.Qxb3#
      • 1...Qa7
        • 2.Rb3#
        • 2.Qb3#
        • 2.Qd3#
        • 2.Qc3#
      • 1...Qb4
        • 2.Ra2#
      • 1...Qa8
        • 2.Rb3#
        • 2.Qb3#
        • 2.Qd3#
        • 2.Qc3#
      • 1...Qe8
        • 2.Rb3#
        • 2.Qb3#
        • 2.Qd3#
        • 2.Qc3#
      • 1...Qb5!
    • 1.Qh3+?
      • 1...Qb3
        • 2.Rxb3#
        • 2.Qxb3#
      • 1...Bg3!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Ra2#
      • 1...Qxb2+
        • 2.Qxb2#
      • 1...Qb3
        • 2.Rxb3#
      • 1...Qg8
        • 2.Qb4#
      • 1...Qh8
        • 2.Qb4#
      • 1...Be5
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(c);N_GUARD::R1(B)
    • Q(c);CHECK,OGATE,XR(B)::QAB1(C),XQ(c)
    • Q(c);N_GUARD::R1(B),XQ(c)
    • Q(c);SBLOCK::R1(B)
    • B(b);S_CUTQ(c)::R1(B)
  • Tries
    • Try
      • R(B);XQ(c)
      • Threat
        • DUALS(3)
      • Vars
        • B(b);SBLOCK,XQ(C)::R1(B)
        • B(b);XR(B)::QAB1(C)
        • B(b);::QAB1(C)
      • Refutation
        • B(b);CHECK
    • Try
      • Q(C);CHECK
      • Refutation
        • B(b);XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • Q(c);CHECK,OGATE,XR(B)::QAB1(C),XQ(c)
        • Q(c);SBLOCK::R1(B)
      • Refutation
        • Q(c);
    • Try
      • Q(C);CHECK
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • Q(C);
    • Threat
      • R1(B)
    • Vars
      • Q(c);CHECK,OGATE,XR(B)::QAB1(C),XQ(c)
      • Q(c);N_GUARD::R1(B),XQ(c)
      • Q(c);N_GUARD::QAB1(C)
      • Q(c);N_GUARD,P_PINR(B)::QAB1(C)
      • B(b);N_GUARD,P_PINR(B)::QAR2(C)
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