MESON Chess Problem Database

Problem Display
PID: 172375 (8/8/8/8/1K6/2Q5/RN6/qk1N4 w - - 0 1)

Andreev, Aleksandr Grigorevich

Bankovskaya gazeta, 1997

8/8/8/8/1K6/2Q5/RN6/qk1N4

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2+
      • 2.Qxb2#
  • Tries
    • 1.Ka3?
      • 1...Qxb2+
        • 2.Qxb2#
      • 1...Qxa2+!
    • 1.Kb3?
      • threat
        • 2.Qc2#
      • 1...Qxb2+
        • 2.Qxb2#
      • 1...Qxa2+!
    • 1.Qd2?
      • threat
        • 2.Sc3#
      • 1...Qxb2+
        • 2.Qxb2#
      • 1...Kxa2
        • 2.Sc3#
      • 1...Qxa2!
    • 1.Qc1+?
      • 1...Kxa2
        • 2.Sc3#
      • 1...Kxc1!
    • 1.Qc2+?
      • 1...Kxa2
        • 2.Sc3#
      • 1...Kxc2!
    • 1.Qb3?
      • 1...Kc1
        • 2.Sd3#
      • 1...Qxb2
        • 2.Qxb2#
      • 1...Qxa2!
    • 1.Qd3+?
      • 1...Kc1
        • 2.Rxa1#
      • 1...Kxa2!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Rxa1#
        • 2.Qxa1#
        • 2.Qc2#
      • 1...Qb2+
        • 2.Qxb2#
      • 1...Qxc3+
        • 2.Sxc3#
      • 1...Kxa2
        • 2.Qb3#
      • 1...Qxa2
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(a);CHECK,OGATE,XS(C)::QAR1(D),XQ(a)
  • Tries
    • Try
      • K(E);P_SPINR(B),S_FLIGHT
      • Vars
        • Q(a);CHECK,N_PINR(B),OGATE,XS(C)::QAR1(D),XQ(a)
      • Refutation
        • Q(a);CHECK,XR(B)
    • Try
      • K(E);P-FLIGHT
      • Threat
        • QAB1(D)
      • Vars
        • Q(a);CHECK,OGATE,XS(C)::QAR1(D),XQ(a)
      • Refutation
        • Q(a);CHECK,XR(B)
    • Try
      • Q(D);
      • Threat
        • S(A)
      • Vars
        • Q(a);CHECK,OGATE,XS(C)::QAR1(D),XQ(a)
        • K(b);S_FLIGHT,XR(B)::S(A)
      • Refutation
        • Q(a);XR(B)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(B)::S(A)
      • Refutation
        • K(b);P-FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(B)::S(A)
      • Refutation
        • K(b);S_FLIGHT,XQ(D)
    • Try
      • Q(D);
      • Vars
        • K(b);P-FLIGHT::S(C)
        • Q(a);OGATE,P_PINQ(D),P_SPINQ(a),XS(C)::QAR1(D),XQ(a)
      • Refutation
        • Q(a);XR(B)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT::R(B),XQ(a)
      • Refutation
        • K(b);S_FLIGHT,XR(B)
  • Actual
    • S(C);
    • Threat
      • DUALS(3)
    • Vars
      • Q(a);CHECK,N_GUARD::QAR1(D),XQ(a)
      • Q(a);CHECK,XQ(D)::S(A),XQ(a)
      • K(b);S_FLIGHT,XR(B)::QAB1(D)
      • Q(a);SBLOCK,XR(B)::QAR1(D)
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