MESON Chess Problem Database

Problem Display
PID: 59798 (8/8/N7/4p3/2RpP2N/2pkP3/P5Q1/R1B1K3 w Q - 0 1)

Retter, Yosef

1st Comm., StrateGems, 2005

8/8/N7/4p3/2RpP2N/2pkP3/P5Q1/R1B1K3

#2

10 + 4

145 StrateGems 2007

SOLUTION

  • SOUND
  • Sets
    • 1...c2
      • 2.Qxc2#
    • 1...dxe3
      • 2.Qe2#
  • Tries
    • 1.Kd1?
      • 1...c2+
        • 2.Qxc2#
      • 1...dxe3
        • 2.Qe2#
      • 1...Kxc4!
    • 1.Kf1?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
    • 1.Sf5?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
    • 1.Sc7?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
    • 1.Sb8?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
    • 1.Rb1?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
    • 1.Qf1+?
      • 1...Kc2
        • 2.Sb4#
        • 2.Qe2#
      • 1...Kxe4!
    • 1.Qc2+?
      • 1...Kxc2
        • 2.Sb4#
      • 1...Kxc4!
    • 1.a3?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
    • 1.a4?
      • 1...dxe3
        • 2.Qe2#
      • 1...c2
        • 2.Qxc2#
      • 1...Kxc4!
  • Keys
    • 1.Qg8!
      • 1...Kc2
        • 2.Sb4#
      • 1...Kxe4
        • 2.Sc5#
      • 1...dxe3
        • 2.Sb4#
      • 1...c2
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);::QAB1(E),XP(a)
    • P(c);XP(F)::QAB1(E)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(a);CHECK::QAB1(E),XP(a)
        • P(c);XP(F)::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • S(I);
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • S(J);
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • S(J);
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • R(A);
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT,XP(H)
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT,XQ(E)::S(J)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(G)
    • Try
      • P(D);
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
    • Try
      • P(D);
      • Vars
        • P(c);XP(F)::QAB1(E)
        • P(a);::QAB1(E),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
  • Actual
    • Q(E);
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::S(J)
      • K(b);P_SPINP(c),S_FLIGHT,XP(H)::S(J)
      • P(c);XP(F)::S(J)
      • P(a);::S(J)
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