MESON Chess Problem Database

Problem Display
PID: 53887 (3N1b1r/4p1kp/4B1qp/2pR3P/7B/2K5/b2PP3/Q5R1 w - - 0 1)

May, John

Chess Life, 1955

3N1b1r/4p1kp/4B1qp/2pR3P/7B/2K5/b2PP3/Q5R1

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg1
      • 2.Qxg1#
    • 1...Qg2
      • 2.Kc2#
      • 2.Kd3#
      • 2.Rxg2#
    • 1...Qg3+
      • 2.Kc2#
      • 2.Rxg3#
    • 1...Qg4
      • 2.Kc2#
      • 2.Kd3#
      • 2.Rxg4#
    • 1...Qg5
      • 2.Kc2#
      • 2.Kd3#
    • 1...Bb1
      • 2.Kb3#
      • 2.Kc4#
    • 1...Bb3
      • 2.Kxb3#
    • 1...Bc4
      • 2.Kxc4#
  • Tries
    • 1.Kb2?
      • threat
        • 2.Kc1#
        • 2.Kxa2#
        • 2.Ka3#
      • 1...Qxg1
        • 2.Qxg1#
      • 1...Bxd5
        • 2.Kc1#
        • 2.Ka3#
      • 1...Qg3
        • 2.Kc1#
        • 2.Kxa2#
        • 2.Kc2#
        • 2.Rxg3#
      • 1...Bb1
        • 2.Kc1#
        • 2.Ka3#
        • 2.Kb3#
      • 1...Bb3
        • 2.Kc1#
        • 2.Ka3#
        • 2.Kxb3#
      • 1...Bc4
        • 2.Kc1#
        • 2.Ka3#
      • 1...c4!
    • 1.Rxc5?
      • threat
        • 2.Kb4#
      • 1...Qxg1
        • 2.Qxg1#
      • 1...Qg4
        • 2.Kc2#
        • 2.Kd3#
        • 2.Rxg4#
      • 1...Bxe6!
    • 1.Qf1?
      • threat
        • 2.Qf7#
      • 1...Qg3+
        • 2.Rxg3#
      • 1...Rg8!
    • 1.d3?
      • threat
        • 2.Kc2#
        • 2.Kd2#
      • 1...Qxg1
        • 2.Qxg1#
      • 1...Qg5
        • 2.Kc2#
      • 1...Bb1
        • 2.Kd2#
        • 2.Kb3#
        • 2.Kc4#
      • 1...Bb3
        • 2.Kd2#
        • 2.Kxb3#
      • 1...c4!
    • 1.e4?
      • threat
        • 2.Kc2#
        • 2.Kd3#
      • 1...Qg3+
        • 2.Kc2#
        • 2.Rxg3#
      • 1...Qxg1
        • 2.Qxg1#
      • 1...Bb1
        • 2.Kb3#
        • 2.Kc4#
      • 1...Bb3
        • 2.Kxb3#
        • 2.Kd3#
      • 1...Bc4
        • 2.Kc2#
        • 2.Kxc4#
      • 1...c4!
  • Keys
    • 1.Bg3!
      • threat
        • 2.Be5#
      • 1...Qc2+
        • 2.Kxc2#
      • 1...Qd3+
        • 2.Kxd3#
      • 1...Qxg3+
        • 2.Kc2#
      • 1...Kf6
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_SPINQ(c),OGATE,XR(B)::QAR(A),XQ(c)
    • B(a);::QAB(A)+K(E),XB(a)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);N_SPINQ(c),OGATE,XR(B)::QAR(A),XQ(c)
      • Refutation
        • P(b);
    • Try
      • R(G);XP(b)
      • Threat
        • QAB(A)+K(E)
      • Vars
        • Q(c);N_SPINQ(c),OGATE,XR(B)::QAR(A),XQ(c)
      • Refutation
        • B(a);XB(I)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • Q(c);CHECK,OGATEB::R(B),XQ(c)
      • Refutation
        • R(i);
    • Try
      • P(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);N_SPINQ(c),OGATE,XR(B)::QAR(A),XQ(c)
        • Q(c);::QAB(A)+K(E)
      • Refutation
        • P(b);
    • Try
      • P(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);N_SPINQ(c),OGATE,XR(B)::QAR(A),XQ(c)
      • Refutation
        • P(b);
  • Actual
    • B(F);N_PINQ(c)
    • Threat
      • B(F)
    • Vars
      • Q(c);CHECK::QAB(A)+K(E),XQ(c)
      • Q(c);CHECK,P_SPINQ(c),XB(F)::QAB(A)+K(E)
      • K(f);S_FLIGHT::B(F)
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