MESON Chess Problem Database

Problem Display
PID: 28316 (8/8/8/8/8/1QB1NK2/1n1q4/1r2k3 w - - 0 1)

Shampovski, DM

Luganskaya Pravda, 1927

8/8/8/8/8/1QB1NK2/1n1q4/1r2k3

#2

4 + 4

3242 BCPS Rapid Solving (Cheltenham) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3
      • 2.Qxc3#
    • 1...Sa4
      • 2.Qxb1#
    • 1...Sc4
      • 2.Qxb1#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Bxd2#
        • 2.Qxd2#
      • 1...Qxc3
        • 2.Qe2#
        • 2.Qf2#
        • 2.Qxc3#
      • 1...Sc4
        • 2.Qxb1#
      • 1...Rd1!
    • 1.Qg8?
      • threat
        • 2.Qg1#
        • 2.Qg3#
      • 1...Sd1
        • 2.Qg1#
      • 1...Sd3
        • 2.Qg1#
      • 1...Qxc3!
    • 1.Qb5?
      • threat
        • 2.Qf1#
        • 2.Qe2#
      • 1...Qxc3
        • 2.Qe2#
      • 1...Sc4
        • 2.Qxb1#
      • 1...Sd3!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Bxd2#
        • 2.Qh4#
      • 1...Qxc3
        • 2.Qxc3#
      • 1...Rd1
        • 2.Qh4#
      • 1...Sd1
        • 2.Bxd2#
      • 1...Sd3
        • 2.Bxd2#
      • 1...Sc4
        • 2.Qxb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(d);N_SPINQ(d),OGATE,P_PINS(C),XB(B)::QAB(A),XQ(d)
    • S(c);OGATE::QAR(A),XR(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD::QAR(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::QAR2(A)
      • Refutation
        • Q(d);N_SPINQ(d),P_PINS(C),XB(B)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(d);N_SPINQ(d),P_PINS(C),XB(B)::QAR1(A)
        • S(c);OGATE::QAR(A),XR(a)
      • Refutation
        • S(c);
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • Q(d);OGATE,P_PINS(C),XB(B)::QAB(A),XQ(d)
      • R(a);::QAB(A)
      • S(c);::B(B),XQ(d)
      • S(c);OGATE::QAR(A),XR(a)
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