MESON Chess Problem Database

Problem Display
PID: 103741 (8/8/1K6/P7/2bR4/k7/P7/1Q6 w - - 0 1)

Rumyantsev, Sergei Yuryewitch

2nd HM., Bron MT, 1986

8/8/1K6/P7/2bR4/k7/P7/1Q6

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qb3#
    • 1...Bf1
      • 2.Qb3#
    • 1...Bxa2
      • 2.Qb4#
    • 1...Be2
      • 2.Qb3#
    • 1...Bb3
      • 2.Qxb3#
    • 1...Bd3
      • 2.Qb3#
    • 1...Bb5
      • 2.Qb3#
    • 1...Ba6
      • 2.Qb3#
  • Tries
    • 1.Rd3+?
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bxd3
        • 2.Qb3#
      • 1...Ka4!
    • 1.Qc1+?
      • 1...Ka4
        • 2.Rxc4#
      • 1...Kb4
        • 2.Rxc4#
      • 1...Kxa2!
    • 1.Qb2+?
      • 1...Ka4
        • 2.Rxc4#
        • 2.Qb3#
      • 1...Kxb2!
  • Keys
    • 1.Qc2!
      • 1...Kb4
        • 2.Qb3#
      • 1...Bxa2
        • 2.Ra4#
      • 1...Bd5
        • 2.Ra4#
      • 1...Bf1
        • 2.Ra4#
        • 2.Qb3#
      • 1...Be2
        • 2.Ra4#
        • 2.Qb3#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bd3
        • 2.Ra4#
        • 2.Qb3#
      • 1...Bb5
        • 2.Qb3#
      • 1...Ba6
        • 2.Ra4#
        • 2.Qb3#
      • 1...Be6
        • 2.Ra4#
      • 1...Bf7
        • 2.Ra4#
      • 1...Bg8
        • 2.Ra4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • K(a);P-FLIGHT,P_SPINB(b)::QAB1(A)
    • B(b);N_GUARD::QAR1(A)
    • B(b);SBLOCK,XP(B)::QAB1(A)
    • B(b);N_GUARD::QAR1(A),XB(b)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(A),XB(b)
        • B(b);N_GUARD,XR(C)::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::R(C),XB(b)
        • K(a);P_SPINB(b),S_FLIGHT::R1(C),XB(b)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(a);P_SPINB(b),S_FLIGHT::QAR1(A)
      • B(b);OGATE,XP(B)::R1(C)
      • B(b);OGATE::R1(C)
      • B(b);N_GUARD::QAR1(A),XB(b)
      • B(b);N_GUARD::QAR1(A)
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