MESON Chess Problem Database

Problem Display
PID: 173750 (8/8/8/8/B7/5Q2/2r1p2K/1N1k4 w - - 0 1)

Boros, Sandor

3rd Comm., Shakhmaty v SSSR, 1937

8/8/8/8/B7/5Q2/2r1p2K/1N1k4

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Kg3?
      • 1...Ke1
        • 2.Qh1#
      • 1...Kc1!
    • 1.Qxe2+?
      • 1...Kc1
        • 2.Qxc2#
      • 1...Kxe2!
    • 1.Qg2?
      • 1...Ke1
        • 2.Qg1#
      • 1...e1Q
        • 2.Qxc2#
      • 1...e1S
        • 2.Qd2#
      • 1...e1B
        • 2.Qxc2#
      • 1...e1R
        • 2.Qxc2#
        • 2.Qd2#
      • 1...Kc1!
    • 1.Qg4?
      • 1...Ke1
        • 2.Qg1#
      • 1...Kc1!
    • 1.Qf2?
      • 1...e1Q
        • 2.Qxc2#
      • 1...e1S
        • 2.Qd2#
      • 1...e1B
        • 2.Qxc2#
      • 1...e1R
        • 2.Qxc2#
        • 2.Qd2#
      • 1...Kc1!
    • 1.Qd3+?
      • 1...Kc1
        • 2.Qxc2#
      • 1...Ke1!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qd2#
      • 1...e1Q+
        • 2.Qxc2#
      • 1...e1B+
        • 2.Qxc2#
      • 1...Kc1
        • 2.Qxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(a);N_SPINP(c),N_SPINR(b),P-FLIGHT::QAR(C)
      • Refutation
        • K(a);N_SPINP(c),N_SPINR(b),P-FLIGHT
    • Try
      • Q(C);CHECK,P_SPINQ(C),XP(c)
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAR1(C),XR(b)
      • Refutation
        • K(a);N_SPINR(b),S_FLIGHT,XQ(C)
    • Try
      • Q(C);N_PINP(c)
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAR2(C)
        • P(c);OGATE,P_PINQ(C),SBLOCK::QAB1(C),XR(b)
        • P(c);OGATE,P_PINQ(C)::QAR1(C)
      • Refutation
        • K(a);N_SPINR(b),P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);N_SPINP(c),N_SPINR(b),P-FLIGHT::QAR2(C)
      • Refutation
        • K(a);N_SPINP(c),N_SPINR(b),P-FLIGHT
    • Try
      • Q(C);N_PINP(c)
      • Vars
        • P(c);OGATE,P_PINQ(C),SBLOCK::QAB1(C),XR(b)
        • P(c);OGATE,P_PINQ(C)::QAR1(C)
      • Refutation
        • K(a);N_SPINR(b),P-FLIGHT
    • Try
      • Q(C);CHECK,N_PINP(c)
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAR1(C),XR(b)
      • Refutation
        • K(a);N_SPINR(b),P-FLIGHT
  • Actual
    • Q(C);N_PINP(c)
    • Threat
      • QAR1(C)
    • Vars
      • P(c);CHECK,SBLOCK::QAB1(C),XR(b)
      • K(a);P-FLIGHT::QAR1(C),XR(b)
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