MESON Chess Problem Database

Problem Display
PID: 157927 (8/8/2QB4/k2r4/2Pb4/8/K7/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

200 Shakhmatni Zadachi, 1983

8/8/2QB4/k2r4/2Pb4/8/K7/8

#2

4 + 3

15148 Sadier Collection 2016
5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Qxb5#
    • 1...Rxd6
      • 2.Qb5#
    • 1...Bc5
      • 2.Qb5#
  • Tries
    • 1.Bc5?
      • threat
        • 2.Qb5#
        • 2.Qa8#
      • 1...Bxc5
        • 2.Qb5#
      • 1...Rd6
        • 2.Qb5#
      • 1...Rd7
        • 2.Qb5#
      • 1...Rd8
        • 2.Qb5#
      • 1...Rxc5!
    • 1.Qa8+?
      • 1...Ba7
        • 2.Qxa7#
      • 1...Kb6!
  • Keys
    • 1.Kb3!
      • threat
        • 2.Bb4#
      • 1...Rb5+
        • 2.Qxb5#
      • 1...Rxd6
        • 2.Qb5#
      • 1...Bb6
        • 2.Qa4#
      • 1...Rc5
        • 2.Bc7#
      • 1...Bc3
        • 2.Bc7#
      • 1...Bc5
        • 2.Qb5#

This anticipates 7379(1999)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAR1(C),XR(c)
    • R(c);N_GUARD,XB(D)::QAR1(C)
    • B(a);S_CUTR(c)::QAR1(C)
  • Tries
    • Try
      • B(D);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XB(D)::QAR1(C)
        • R(c);::QAR1(C)
      • Refutation
        • R(c);XB(D)
    • Try
      • Q(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR2(C),XB(a)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • K(A);S_FLIGHT
    • Threat
      • B(D)
    • Vars
      • R(c);CHECK,N_GUARD::QAR1(C),XR(c)
      • R(c);N_GUARD,XB(D)::QAR1(C)
      • B(a);SBLOCK::QAR1(C)
      • R(c);S_CUTB(a)::B(D)
      • B(a);N_GUARD::B(D)
      • B(a);S_CUTR(c)::QAR1(C)
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